Fu H B, Hu Y J, Bernstein E R
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
J Chem Phys. 2005 Dec 15;123(23):234307. doi: 10.1063/1.2135772.
IR+UV double resonant ion-dip and ion-enhancement spectroscopies are employed to study the nu3 asymmetric CH stretch vibration fundamental of CH3 in the ground and 3p(z) Rydberg electronic states. CH3 radical is synthesized in the supersonic jet expansion by flash pyrolysis of azomethane (CH3NNCH3) prior to the expansion. The Q band of the 3(1) (1) 3p(z)<--X transition of CH3, not detected by conventional UV resonantly enhanced multiphoton ionization (REMPI) spectroscopy, is determined to lie at 59,898 cm(-1) using IR+UV REMPI spectroscopy. Energy of the asymmetric CH stretch of CH3 in the 3p(z) Rydberg state, nu3(3p(z)), is 3087 cm(-1), redshifted by approximately 74 cm(-1) with respect to ground state nu3(X).
采用红外+紫外双共振离子偶极和离子增强光谱技术，研究了基态和3p(z)里德堡电子态下CH₃的ν₃不对称CH伸缩振动基频。在超声速射流膨胀之前，通过偶氮甲烷（CH₃NNCH₃）的闪光热解在其中合成CH₃自由基。利用红外+紫外共振增强多光子电离（REMPI）光谱，确定了CH₃的3(1)(1) 3p(z)←X跃迁的Q带位于59898 cm⁻¹处，这是传统紫外共振增强多光子电离光谱未检测到的。CH₃在3p(z)里德堡态下的不对称CH伸缩振动能量ν₃(3p(z))为3087 cm⁻¹，相对于基态ν₃(X)红移了约74 cm⁻¹。
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