Near-infrared high resolution diode laser spectrum of the CH2(b)over-tilde(1)B(1)<-(a)over-tilde(1)A(1) transition

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/28383

Title:	Near-infrared high resolution diode laser spectrum of the CH2(b)over-tilde(1)B(1)<-(a)over-tilde(1)A(1) transition
Authors:	Fockenberg,C;Marr,AJ;Sears,TJ;Chang,BC
Contributors:	中央大學
Keywords:	RENNER-TELLER;SPECTROSCOPY;CH2;HCCL;ABSORPTION;METHYLENE
Date:	1998
Issue Date:	2010-06-29 19:47:36 (UTC+8)
Publisher:	化學研究所
Abstract:	A new diode laser-based spectrometer operating at wavelengths close to 1 mu m has been constructed for transient absorption measurements in the gas phase. Using a dual beam detection system for noise cancellation, the minimum detectable absorption was found to be 1 x 10(-4) in 0.5 mu sec. The sensitivity of the instrument is illustrated by the observation of previously undetected spectra of singlet methylene (CH2) between 9780 and 10070 cm(-1). Rovibronic transitions involving two K-a = 1 levels, nominally associated with v(2)(bent) = 1 and 2, in the upper, <(b)over tilde B-1(1)> state have been assigned. These levels are the lowest so far observed for methylene in this electronic state and their positions provide new information on the shape of the bending potential for the molecule at energies approaching that at which the two lowest singlet states (<(a)over tilde (1)A(1)> and <(b)over tilde B-1(1)>) of the molecule become degenerate at the linear configuration. (C) 1998 Academic Press.
Relation:	JOURNAL OF MOLECULAR SPECTROSCOPY
Appears in Collections:	[Graduate Institute of Chemistry] journal & Dissertation

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