Terahertz Spectroscopy of Linear Triatomic CCC: High Precision Laboratory Measurement and Analysis of the Ro-Vibrational Bending Transitions

2003 ◽  
Vol 58 (2-3) ◽  
pp. 129-138 ◽  
Author(s):  
Ralf Gendriesch ◽  
Kai Pehl ◽  
Thomas Giesen ◽  
Gisbert Winnewisser ◽  
Frank Lewen I.
Keyword(s):  
Terahertz Spectroscopy ◽  
Essential Feature ◽  
Carbon Cluster ◽  
Absolute Frequency ◽  
Bending Vibration ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Vibration Rotation ◽  
Frequency Calibration ◽  
Electronic Ground

We report concise measurements of the bending vibration transition (0,11,0) ← (0,00,0) near 63.416529(40) cm−1 of the carbon cluster CCC in the electronic ground state (X1Σ+g ). The ν2 vibration- rotation spectrum consists of P-, Q-, and R-branch transitions. A total of ten ro-vibrational transitions have been measured with the Cologne Sideband Spectrometer for Terahertz Applications, COSSTA. It is essentially a Backward Wave Oscillator (BWO) based, and frequency stabilized sideband spectrometer. The essential feature of COSSTA is the absolute frequency accuracy of the measurements. Absolute frequency calibration is better than 5 kHz at 2 THz, i. e. COSSTA reaches microwave accuracy. The band centre frequency was determined to be 1.901181506(162) THz: The derived molecular parameters are: (0,00,0) : B = 12908.242(142) MHz; D = 44.30(40) kHz; H = 4.068(184) Hz; (0,11,0) : B = 13262.946(109) MHz; D = 70.33(39) kHz; H = 7.71(38).

A Quasi-Optical Multiplier for Terahertz Spectroscopy

1995 ◽  
Vol 50 (12) ◽  
pp. 1182-1186 ◽  
Author(s):  
F. Lewen ◽  
S. P. Belov ◽  
F. Maiwald ◽  
Th. Klaus ◽  
G. Winnewisser
Keyword(s):  
Fundamental Frequency ◽  
Terahertz Spectroscopy ◽  
Frequency Multiplier ◽  
Optical Frequency ◽  
Absorption Cell ◽  
Linear Element ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Ridged Waveguide ◽  
Harmonic Power

Abstract The rotational K-structure (K = 0, ... 6) of the a-type transition (J = 65 - 64) of the symmetric top molecule methylcyanide, CH3CN, has been recorded at 1.2 THz employing a newly designed quasi-optical frequency multiplier. A planar Schottky diode is used as non-linear element for producing the harmonic power and is mounted in the focus of an off-axis antenna across a short single ridged waveguide. The 2nd harmonic of the fundamental frequency is filtered with adichroic plate and is focused onto the InSb bolometer after passing an absorption cell. The multiplier is driven by a high power backward wave oscillator with a fundamental frequency near 600 GHz.

Theoretical and experimental investigations of the cyclotron interaction effect on relativistic backward-wave oscillator operation

1993 ◽  
Author(s):  
Baruch Levush ◽  
A. Vlasov ◽  
Gregory S. Nusinovich ◽  
Alan Bromborsky ◽  
Thomas M. Antonsen, Jr. ◽  
...  
Keyword(s):  
Interaction Effect ◽  
Experimental Investigations ◽  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave

Experiment on the plasma-loaded backward-wave oscillator using a gas-loaded foil-less diode

2000 ◽  
Vol 88 (5) ◽  
pp. 3059-3063 ◽  
Author(s):  
Bao-Liang Qian ◽  
Chuan-Lu Li ◽  
Yong-Gui Liu ◽  
Jian-De Zhang ◽  
Qi-Mei Tan ◽  
...  
Keyword(s):  
Backward Wave Oscillator ◽  
Wave Oscillator ◽  
Backward Wave
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