A highly-integrated supersonic-jet Fourier transform microwave spectrometer

Grabow, Jens-Uwe

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https://hdl.handle.net/2142/97037 Copy

Description

Title

A highly-integrated supersonic-jet Fourier transform microwave spectrometer

Author(s)

Grabow, Jens-Uwe

Contributor(s)

• Feng, Gang
• Gou, Qian

Issue Date

2017-06-20

Keyword(s)

Instrument/technique demonstration

Abstract

A highly integrated supersonic-jet Fourier-transform microwave spectrometer of coaxially oriented beam-resonator arrangement (COBRA) type, covering 2-20GHz, has been recently built at Chongqing University, China. _x000d_ Built up almost entirely in an NI PXIe chassis, we take the advantage of the NI PXIe-5451 Dual-channel arbitrary waveform generator and the PXIe-5654 RF signal generator to create a spectrometer with wobbling capacity for fast resonator tuning. Based on the I/Q modulation, associate with PXI control and sequence boards built at the Leibniz Universitat Hannover, the design of the spectrometer is much simpler and very compact._x000d_ The Fabry–Pérot resonator is semi-confocal with a spherical reflector of 630 mm diameter and a radius of 900 mm curvature and one circulator plate reflector of 630 mm diameter. The vacuum is effectuated by a three-stage mechanical (two-stage rotary vane and roots booster) pump at the fore line of a DN630 ISO-F 20000 L/s oil-diffusion pump. The supersonic-jet expansion is pulsed by a general valve Series 9 solenoid valve which is controlled by a general valve IOTA one driver governed by the experiment-sequence generation._x000d_ First molecular examples to illustrate the performance of the new setup will include OCS and chem{CF_3CHFCl}._x000d_

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97037

DOI

https://doi.org/10.15278/isms.2017.TH03

Copyright and License Information

Copyright 2017 Jens-Uwe Grabow

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