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

Autor:	R. Gendriesch, Thomas F. Giesen, I Frank Lewen, Gisbert Winnewisser, Kai Pehl
Rok vydání:	2003
Předmět:	Spectrometer Sideband Terahertz radiation Chemistry Triatomic molecule General Physics and Astronomy Backward-wave oscillator Physical and Theoretical Chemistry Atomic physics Ground state Mathematical Physics Microwave Terahertz spectroscopy and technology
Zdroj:	Zeitschrift für Naturforschung A. 58:129-138
ISSN:	1865-7109 0932-0784
Popis:	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).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::37cf3dc3107771ba5bc4a1064f7a7cf3 https://doi.org/10.1515/zna-2003-2-310 Zobrazit plný text záznamu