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

28-30 September 2016
Tagungstätte Schloss Ringberg, Kreuth
UTC timezone
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# Contribution Contributed Talk

Tagungstätte Schloss Ringberg, Kreuth -
MORNING SESSION 1 - GAS PHASE

# Double Resonance Spectroscopy of Deuterated Species in Ion Traps

## Speakers

• Dr. Pavol JUSKO

## Content

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 below 1 MHz, using a frequency-comb and standard laser induced reaction scheme. The obtained datasets allow us to consequently predict pure rotational transition frequencies within couple of MHz.

As a second step we, apply double resonance technique, involving microwave(THz) and IR photon at the same time, since THz photon alone rarely carries enough energy to promote deuterium exchange reaction used as action spectroscopy scheme. The IR radiation is locked to a know rovibrational transition, while the THz frequency is being swept around the frequency determined in the first step, making this technique very efficient.