Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics

MO 11.22: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

A chirped pulse spectrometer for supersonic jet applications — •Johanna Chantzos, Doris Herberth, and Thomas Giesen — Universität Kassel, Kassel 34132, Deutschland

We present an experimental setup for a broadband chirped pulse Fourier transform spectrometer. This technique enables fast scan absorption spectroscopy of transient molecules with astrophysical relevance.

An arbitrary waveform generator (AWG) with a 400 MSamples/s sample rate generates chirped pulses with a linear frequency sweep in the MHz regime and a pulse duration of a few microseconds. These pulses are up-converted in the microwave frequency range with a 10 GHz Synthesizer and subsequently pass through a multiplier that increases the pulse bandwidth without changing the pulse duration. The pulses are coupled into a gas cell either for absorption or emission spectroscopy of a free induction decay signal (FID). A high-speed oscilloscope provides the frequency domain spectrum by fast Fourier-transformation of the signal.

Species of relevance are carbon chain molecules and small metal-containing refractory molecules. Recent results and development are presented.