The CP-FTS (Chirped Pulse Fourier Transform Spectrometer)

A broadband Chirped-Pulse Fourier Transform Spectrometer (CP-FTS) can be found in the CAS laboratories. At the moment, it covers the frequency range of 6–26 GHz, with an instantaneous bandwidth of 7 GHz. A frequency extension is also in progress, to provide access to frequencies in the range of 80–110 GHz.

The radiation source is an active multiplier chain drive by a cm-wave frequency synthesizer (9–42 GHz).

The electronics are situated in a movable rack, so that it can be most easily coupled to a variety of chambers/cells, depending on the desired sample to study. At the moment, only a 1.5-meter, vacuum-capable waveguide is available; there are plans to eventually couple it to both a vacuum chamber containing a supersonic free-jet expansion for studying unstable molecules, and to a buffer-gas cooling cell for studying collisional rates.

<p style="margin-bottom: 0in; font-style: normal; font-weight: normal; line-height: 100%;" lang="en-GB" align="left"><span style="color: #000000;"><span style="font-family: Univers,sans-serif;"><span style="font-size: small;">The CP-FTS coupled to the 1.5m-long waveguide cell.</span></span></span></p>

The CP-FTS coupled to the 1.5m-long waveguide cell.

<p style="margin-bottom: 0in; font-style: normal; font-weight: normal; line-height: 100%;" lang="en-GB" align="left"><span style="color: #000000;"><span style="font-family: Univers,sans-serif;"><span style="font-size: small;">The recording of a 4 GHz scan of the inversion spectrum of an ammonia sample. This spectrum was obtained after an integration of 250,000 pulses over ca. 20 minutes.</span></span></span></p>

The recording of a 4 GHz scan of the inversion spectrum of an ammonia sample. This spectrum was obtained after an integration of 250,000 pulses over ca. 20 minutes.

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