# Workshop on LABORATORY ASTROPHYSICS: Interstellar Gas, Dust and Ice

28-30 September 2016
Tagungstätte Schloss Ringberg, Kreuth
UTC timezone
Home > Contribution List

## Contribution List

Displaying 39 contributions out of 39
Type: Poster Track: POSTERS
The origin of diffuse interstellar bands (DIBs)$^1$ and the unidentified infrared emission bands (UIEs)$^2$ are long standing questions of modern astrophysics. DIBs are absorption features of astronomical objects in the visible to near-infrared range whereas the UIEs can be found in the emission spectra of astronomical objects. At the Max Institute for Nuclear Physics we are developing a new spect ... More
Presented by Mr. Jürgen GÖCK
Type: Poster Track: POSTERS
The Cryogenic Storage Ring (CSR) has been recently commissioned at the Max Planck Institute for Nuclear Physics, Heidelberg. We have demonstrated ion storage at conditions comparable to those in cold interstellar medium, i.e., at temperatures down to ∼ 6 K and residual gas densities ∼ 140 cm$^−3$ . On the poster we will present part of the first physics results as well as the status on th ... More
Presented by Dr. Oldrich NOVOTNY
Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND
We report the observation of sequential collisions of fullerenes with C atoms in an extremely cold environment. Experiments were performed inside helium droplets at 0.37 K doped with $\text C_{60}$ molecules and C atoms. Our results show that C-atom additions can transform a chemically inert fullerene $\text C_{60}$ into chemically reactive carbenes $\text C_{60}(\text C:)_n$. Carbenes should ... More
Presented by Dr. Sergiy KRASNOKUTSKIY
Type: Contributed Talk Track: AFTERNOON SESSION - SOLID PHASE
Recently, four Diffuse Interstellar Bands (DIBs) were assigned to C60+ [1,2]. While investigating C60+ in various cryogenic matrixes, we have observed LIF in the near- IR, when exciting the near-IR vibronic bands of C60+. Power dependence measurements revealed a one-photon LIF process. In contrast, excitation in the UV does not lead to the emission of C60+ in the vicinity of its NIR absorpti ... More
Presented by Dr. Dmitry STRELNIKOV
Type: Invited Talk Session: AFTERNOON SESSION - GAS PHASE
Track: AFTERNOON SESSION - GAS PHASE
The CRESU $^1$ technique is based on the isentropic expansion of a gas through a Laval Nozzle which acts as a guide and makes the gas velocity streamlines parallel at its exit. This generates a cold supersonic flow which is uniform in temperature and density along several tens of centimetres downstream of the Laval Nozzle. As the cold gas is never in contact with the walls of the experiment, r ... More
Presented by Dr. André CANOSA on 28 Sep 2016 at 17:15
Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND
The Chirped-Pulse Fourier Transform Spectrometer (CPFTS) at the CAS laboratories at MPE has been used to revisit the microwave studies of collision induced transitions between rotational levels of ammonia done by T. Oka (J. Chem. Phys. 48, 4919 (1968)) in order to study the capabilities of the CPFTS to derive important constraints on collisional rates. Selected inversion doublets have been 'p ... More
Presented by Dr. Christian ENDRES
Type: Invited Talk Session: MORNING SESSION 1 - GAS PHASE
Track: MORNING SESSION 1 - GAS PHASE
High-precision spectroscopy relies on high signal-to-noise data and optimal calibration. The technogical limits of calibration are often set by detector noise and instrument stability, but the latest generation of high-resolution stabilized spectrographs (e.g., HARPS, CARMENES, ESPRESSO, E-ELT HIRES) are also designed for experiments that require frequency precision as high as 10$^{-10}$ or 1 ... More
Presented by Prof. Ansgar REINERS on 29 Sep 2016 at 09:00
Type: Poster Track: POSTERS
Abstract: (poster presentation) Water is one of the most important and interesting molecules in the universe. It plays a significant role in cooling processes and is elementary for terrestrial life. Water has been found in many star forming regions, but its interstellar formation mechanism is still not fully understood. Nowadays it is believed that water is mainly formed on grain surfaces and tha ... More
Presented by Dr. Guido FUCHS, Ms. Doris HERBERTH, Ms. Johanna CHANTZOS, Mr. Daniel WITSCH, Prof. Thomas GIESEN
Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND
Small carbon chain molecules like linear $\text{C}_3$ are thought to play a crucial role in the formation of larger, complex molecules, including pre-biotic species. The formation pathways of organic molecules with carbon chains as backbones is by far not well understood. Studies of isotope fractionation have proven to be a useful tool of tracing chemical reaction pathways and to elucidate formati ... More
Presented by Prof. Thomas GIESEN
Type: Contributed Talk Session: MORNING SESSION 1 - GAS PHASE
Track: MORNING SESSION 1 - GAS PHASE
We present recent measurements of the fundamental rotational transitions of $\text{H}_2\text{D}^+$, $\text{D}_2\text{H}^+$, $\text{CD}_2\text{H}^+$, $\text{CH}_2\text{D}^+$ and $\text{C}_2\text{HD}^+$ carried out in a 22-pole Ion Trap. Experimental method, used in Cologne group, has two substantial steps. First, NIR rovibrational transitions are determined with high accuracy, generally b ... More
Presented by Dr. Pavol JUSKO on 29 Sep 2016 at 09:45
Type: Poster Track: POSTERS
Experimental astrophysics is an ever growing and multi-disciplinary field. It ranges from engineering topics like building instruments for the E-ELT or other telescopes, till atomic and molecular physics needed for I2-gas cells used for calibration of spectrographs. At the institute of Astrophysics Göttingen we established an experimental facility to cover different topics. Our core science is a ... More
Presented by Dr. Philipp HUKE
Type: Contributed Talk Session: AFTERNOON SESSION - GAS PHASE
Track: AFTERNOON SESSION - GAS PHASE
The recombination of deuterated trihydrogen cations $\rm H_3^+$ , $\rm H_2D^+$ , $\rm HD_2^+$ and $\rm D_3^+$ with electrons has been studied in stationary afterglow experiment with decaying plasma in $\rm He/Ar/ H_2 / D_2$ gas mixture. By monitoring the time evolutions of densities of all four cations during an afterglow as a function of $\rm H_2$ and $\rm D_2$ densities, using cavity ring down ... More
Presented by Prof. Juraj GLOSIK on 28 Sep 2016 at 16:15
Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND
The search for complex organic molecules (COMs) in the interstellar medium (ISM) has revealed chemical species of ever greater complexity, in particular thanks to observations of the star-forming molecular cloud core Sgr B2(N). It relies heavily on the work done in the laboratory to record and characterize the spectra of these molecules. I will present results of the EMoCA survey conduct ... More
Presented by Dr. Arnaud BELLOCHE
Type: Poster Track: POSTERS
One of the unsolved puzzles in astrochemistry is the surprisingly high abundance of the ionized water molecule (H$_2$O$^+$) in the interstellar medium. The high abundance is unexpected because the measured reaction rate coefficients of H$_2$O$^+$ with H$_2$ [1] (6.6 x 10$^{-10}$ cm$^{-3}$ s$^{-1}$, a relatively high value) suggest that the ubiquitous H$_2$ in space will readily react with it to fo ... More
Presented by Dr. Sunil Kumar SUDHAKARAN
Type: Contributed Talk Session: MORNING SESSION 1 - GAS PHASE
Track: MORNING SESSION 1 - GAS PHASE
A possible pathway to gas phase formation of ammonia in interstellar medium is a sequence of hydrogen abstraction reactions of ions with H$_2$, forming NH$_4^+$ from N$^+$. The NH$_4^+$ ions then may recombine with electrons by dissociative recombination towards NH$_3$. The first and last steps of this abstraction sequence, reactions $\rm N^+ + H_2 \to NH^+ + H$ and $\rm NH_3^+ + H_2 \to NH_4 ... More Presented by Dr. Roucka STEPAN on 29 Sep 2016 at 10:00 Type: Contributed Talk Track: MORNING SESSION 2 - SOLID PHASE About 200 molecular species were detected in the ISM. Some of them are complex organic molecules (COMs), molecules with more than 6 atoms containing one or multiple C atoms. Some COMs can reach a certain degree of complexity and can have a prebiotic relevance. Knowing whether COMs contributed or not to the chemical evolution needed for the emergence of life is one of the open questions in the orig ... More Presented by Dr. Albert RIMOLA Type: Poster Track: POSTERS Short carbon chains are fundamental for the chemistry of stellar and interstellar ambiences: They are omnipresent throughout the interstellar medium, they likely participate in the formation of long carbon chains and they are products in photo-fragmentation processes of larger species. Triatomic carbon,$\text{C}_3$, exhibits a mid-infrared$\nu_3$antisymmetric stretching mode and a$\nu_2$-bendi ... More Presented by Mr. Thomas BUECHLING, Mr. Alexander BREIER Type: Poster Track: POSTERS An advanced method of producing metal-containing small molecules in the gas phase is based on laser ablation technique. The vaporized gas phase products can be investigated by means of millimeter-submillimeter-wave spectroscopy or by using high-resolution spectrometers in the visible frequency range. The experimental investigation is guided by high-level quantum chemical calculations performed at ... More Presented by Mr. Björn WAßMUTH, Mr. Alexander BREIER Type: Invited Talk Track: AFTERNOON SESSION - SOLID PHASE This talk reviews recent experiments performed on interstellar ices as obtained in the Sackler Laboratory for Astrophysics ([www.laboratory-astrophysics.eu][1]). The five setups presently operational focus on IR and UV/VIS spectroscopic or mass spectrometric studies of interstellar ices, with the aim either to characterize ice morphologies (composition and geometry) for preset conditions or t ... More Presented by Prof. Harold LINNARTZ Type: Invited Talk Track: MORNING SESSION 2 - SOLID PHASE The experimental activity that we carry out in Catania is mainly devoted to the study of the effects induced by fast ions (30-400 keV) and UV photons (energetic processing) on astrophysically relevant solids (ice mixtures, silicates, and carbonaceous materials). Ices samples (10-300 K) are analyzed by Infrared and Raman spectroscopy which are two powerful techniques to evidence the formation of ... More Presented by Dr. Maria Elisabetta PALUMBO Type: Contributed Talk Track: MORNING SESSION 2 - SOLID PHASE We observed the water ice toward the starless cores in the Pipe Nebula. The motivation is to look at the early phases of the ice accretion in the environment devoid of star formation. The water ice optical depth in the Pipe Nebula is about half as much as is expected by the canonical relation of the ice optical depth on A_V in Taurus. One of the explanations is the formation of the ice mantl ... More Presented by Dr. Miwa GOTO Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND We present a combined experimental and theoretical study on the importance of quantum tunneling of atoms in the reaction between CH4 and OH and isotope-substited analogs. Although this reaction has been studied previously both on the surface and in the gas phase, quantification of the reaction rates at low temperature is not trivial in either case. Quantitative rates, however, are needed for astro ... More Presented by Dr. Thanja LAMBERTS Type: Invited Talk Session: AFTERNOON SESSION - GAS PHASE Track: AFTERNOON SESSION - GAS PHASE H$_3^+$was discovered by J.J.Thomson in 1911 [1]. A fundamental exotic molecule, H$_3^+$intrigued many physicists and chemists. Early studies involving big names such as J. Stark, N. Bohr, A. Dempster, T.R. Hogness, H.D. Smyth, C.A. Coulson, J. Hirschfelder, H. Eyring, G. Herzberg and others are summarized in a recent review [2]. Its abundance in interstellar space was first suggested by 3 plasm ... More Presented by Prof. Takeshi OKA on 28 Sep 2016 at 15:15 Type: Invited Talk Session: AFTERNOON SESSION - GAS PHASE Track: AFTERNOON SESSION - GAS PHASE Cosmic rays play a vital role in initiating the chemistry that occurs in molecular clouds. The ionization of H and H$_2$begins a network of ion-molecule reactions responsible for generating many of the diatomic and small polyatomic molecules observed in the interstellar medium. A few such species --- OH$^+$, H$_2$O$^+$, and H$_3^+$in particular --- are formed and destroyed by rather simple pro ... More Presented by Dr. Nick INDRIOLO on 28 Sep 2016 at 15:45 Type: Contributed Talk Track: AFTERNOON SESSION - SOLID PHASE Cometary ices have been considered to be one of the possible sources of organic compounds responsible for the origin and early evolution of life on Earth [1]. A number of amino acids have been found in meteorites [2] and produced in interstellar ice analogues in the laboratory [3, 4]. On this background, there is in the last years an increasing interest to study the formation of complex organic mo ... More Presented by Dr. Alexey POTAPOV Type: Invited Talk Track: MORNING SESSION 2 - SOLID PHASE There is an increasing observational evidence that a non-negligible fraction of the cosmic carbon is locked into macromolecules, mainly Polycyclic Aromatic Hydrocarbons (PAHs) and fullerene C60. However, very little is known about the formation pathways and physical processing of such structures under the extreme conditions commonly found in space. In the first part of this talk I will discuss ... More Presented by Dr. Elisabetta MICELOTTA Type: Contributed Talk Session: MORNING SESSION 1 - GAS PHASE Track: MORNING SESSION 1 - GAS PHASE The Cryogenic Storage Ring (CSR) [1] located at the Max-Planck-Institut für Kernphysik in Heidelberg is an electrostatic storage ring with a circumference of 35 m in a fully cryogenic environment. Due to the low temperature of the inner experimental chambers (~6K) and an extreme vacuum, with residual gas densities below 140 cm$^-3$, the CSR is able to imitate the conditions of interstellar sp ... More Presented by Christian MEYER on 29 Sep 2016 at 09:30 Type: Contributed Talk Track: MORNING SESSION 2 - SOLID PHASE Complex organic molecules (COMs) have been observed in hot cores of low- and high-mass protostars, and in cold dense regions of the interstellar medium. It is generally accepted that such COMs form in the solid state through radical diffusion reactions on icy dust grains. In the past decade, modeling and laboratory studies have been in favor of scenarios in which energetic triggers, i.e., impactin ... More Presented by Mr. Ko-Ju CHUANG Type: Contributed Talk Track: AFTERNOON SESSION - SOLID PHASE A cryogenic equipment is installed in the laboratory of the CAS group located at MPE in Garching, in order to study the spectroscopic properties of astrophysically-relevant solids. This experiment is being developed with the goal to characterize ice mixtures, silicates, and carbonaceous materials. For this experiment, a combination of spectral techniques is implemented to obtain information rega ... More Presented by Dr. Barbara Michela GIULIANO Type: Contributed Talk Session: AFTERNOON SESSION - GAS PHASE Track: AFTERNOON SESSION - GAS PHASE Protonated CO$_2$is a molecule of astrophysical interest because it’s an indirect tracer of carbon dioxide. Being CO$_2$a main constituent of interstellar ices, its chemistry provides important information on the interplay of gas- and solid-phase chemistry in space. Bogey and coworkers measured in the late 80s the rotational spectra of HOCO$^+$and DOCO$^+$up to 420 GHz (1,2). We have e ... More Presented by Dr. Valerio LATTANZI on 28 Sep 2016 at 18:15 Type: Contributed Talk Session: AFTERNOON SESSION - GAS PHASE Track: AFTERNOON SESSION - GAS PHASE *Detection of new'' species.* There is a great interest in understanding which molecular species containing sulfur might be observed in the ISM. The work along this line concerns the investigation of radicals and ionic species, guided by high accuracy state-of-the-art quantum-chemical computations. Among radicals, we mention HSO. High-resolution measurements of its rotational spectrum have bee ... More Presented by Prof. CRISTINA PUZZARINI on 28 Sep 2016 at 17:45 Type: Poster Track: POSTERS The submillimeter-wavelength absorption of water ice and its temperature dependence are still poorly known. We have made use of facilities at IGEP Braunschweig to produce thick layers of water ice particles by freezing of micron-sized droplets in a LN2-temperature environment. While these layers were brought to increasingly warmer regions of the experiment, the absorption for submillimeter radiati ... More Presented by Dr. Harald MUTSCHKE Type: Contributed Talk Session: AFTERNOON SESSION - GAS PHASE Track: AFTERNOON SESSION - GAS PHASE At the laboratory astrophysics group in Kassel a new broadband fast sweep spectrometer at MW to submm wavelengths has been setup in order to study transient molecules in a supersonic jet. An arbitrary waveform generator (AWG) is used to generate chirped pulses with a linear frequency sweep in the 100 MHz regime and pulse durations of a few microseconds. These pulses are up-converted to the 20-100 ... More Presented by Ms. Doris HERBERTH on 28 Sep 2016 at 18:00 Type: Poster Track: POSTERS$\text C_{3}$, a molecule of great interest to combustion processes and astrochemistry (see e.g. [1]), is a challenging species for contemporary quantum chemistry. Its electronic ground state is characterized by a very shallow bending potential that gives rise to unusually large rovibrational coupling. Although previous theoretical studies [2] have come in close agreement with experiment, we dee ... More Presented by Mr. Benjamin SCHRÖDER Type: Invited Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND Fundamental molecular data play a key role for spectral characterization of astrophysical objects cool enough to form molecules in their atmospheres (cool stars, extrosolar planets and planetary discs) as well as in a broad range terrestrial applications. However, at elevated temperatures, the laboratory data for a number of key species is absent, inaccurate or incomplete. The ExoMol project aims ... More Presented by Prof. Jonathan TENNYSON Type: Invited Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND Although astrochemistry has enjoyed many significant successes throughout the years, there are also a number of unsolved problems or partially solved problems which remain to be solved. In my view, the top three such problems are: 1. Understanding how the larger molecules in interstellar clouds are synthesized, and their connection to astrobiology, 2. Understanding how the different distribut ... More Presented by Prof. Eric HERBST Type: Contributed Talk Track: AFTERNOON SESSION - SOLID PHASE Polycyclic aromatic hydrocarbons (PAHs) are volatile species that are expected to freeze out under dark interstellar cloud conditions on icy grains where they are exposed to UV photons. In the laboratory, PAHs embedded in water matrices, as well as their photo-induced derivatives, have been largely studied using infrared spectroscopy (IR) as the principle diagnostic tool. This method benefits from ... More Presented by Mr. Vincent KOFMAN Type: Poster Track: POSTERS Silicon-carbides, e.g., SiC, SiC$_2$, Si$_2$C, c-SiC$_3$, and SiC$_4\$ , have been found in circumstellar envelopes by means of radio-astronomical observations. They are thought as building blocks of interstellar dust grains featuring the characteristic infrared emission at 11.5 μm in cool evolved carbon-rich giant stars. Despite their prominent role in astrochemical processes of dust form ... More
Presented by Daniel WITSCH
Type: Contributed Talk Track: MORNING SESSION - GAS, DUST, ICE AND BEYOND
State-of-the-art observational technologies at facilities such as the Atacama Large Millimeter/submillimeter Array (ALMA), and others, are allowing scientists to explore some long-standing astronomical questions about chemical evolution. The rapid increase in data from these sources necessitates a concurrent increase in high-quality laboratory spectroscopy. Broadband rotational spectroscopy is a ... More
Presented by Mr. Benjamin ARENAS