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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50846


    Title: CH(2)(b)over-tilde(1)B(1)-(a)over-tilde(1)A(1) Band Origin at 1.20 mu m
    Authors: Chang,CH;Xin,J;Latsha,T;Otruba,E;Wang,Z;Hall,GE;Sears,TJ;Chang,BC
    Contributors: 化學學系
    Keywords: OPTICAL DOUBLE-RESONANCE;MAGNETIC-ROTATION SPECTROSCOPY;ORBITAL ANGULAR-MOMENTUM;SINGLET METHYLENE;RENNER-TELLER;ABSORPTION-SPECTROSCOPY;VIBRATIONAL RESONANCES;VISIBLE ABSORPTION;1A1 STATE;CH2
    Date: 2011
    Issue Date: 2012-03-27 18:11:20 (UTC+8)
    Publisher: 國立中央大學
    Abstract: The origin band in the (b) over tilde (1)B(1)-(a) over tilde (1)A(1) transition of CH(2) near 1.2 mu m has been recorded at Doppler-limited resolution using diode laser transient absorption spectroscopy. The assignments of rotational transitions terminating in upper state levels with K(a) = 0 and 1, were confirmed by ground state combination differences and extensive optical-optical double resonance experiments. The assigned lines are embedded in a surprisingly dense spectral region, which includes a strong hot band, (b) over tilde (0,1,0) K(a) = 0-(a) over tilde (0,1,0) K(a) = 1 sub-band lines, with combination or overtone transitions in the (a) over tilde (1)A(1), state likely responsible for the majority of unassigned transitions in this region. From measured line intensities and an estimate of the concentration of CH(2) in the sample, we find the transition moment square for the 0(00)<- 1(10) transition in the (b) over tilde (1)B(1)(0,0,0)(0)-(a) over tilde (1)A(1)(0,0,0)(1) sub-band is 0.005(1) D(2). Prominent (b) over tilde (1)B(1)(0,1,0)(0)-(a) over tilde (1)A(1)(0,1,0)(1) hot band lines were observed in the same spectral region. Comparison of the intensities of corresponding rotational transitions in the two bands suggests the hot band has an intrinsic strength approximately 28 times larger than the origin band. Perturbations of the excited state K(a) = 0 and 1 levels are observed and discussed. The new measurements will lead to improved future theoretical modeling and calculations of the Renner-Teller effect between the (a) over tilde and (b) over tilde states in CH(2).
    Relation: JOURNAL OF PHYSICAL CHEMISTRY A
    Appears in Collections:[化學學系] 期刊論文

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