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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Resonance-Enhanced Multiphoton Ionization of CH_2Br_2: Rydberg States, Photofragmentation, and CH Spectra
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Resonance-Enhanced Multiphoton Ionization of CH_2Br_2: Rydberg States, Photofragmentation, and CH Spectra

机译：CH_2Br_2的共振增强多光子电离：Rydberg态，光碎裂和CH光谱

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摘要

Mass-resolved (2 + n) resonance-enhanced multiphoton ionization (REMPI) spectra of CH_2Br_2 in the two-photon resonance excitation region from 71 200 to 82 300 cm~(-1) were recorded and analyzed. Spectral structures allowed characterization of new molecular Rydberg states. C~*(~1D_2) was found to be an important intermediate in the photodissociation processes. A broad spectral feature peaking at about 80 663 cm~(-1) in the C~+ spectrum and frequently seen in related studies is reinterpreted and associated with switching between three- and two-photon ionization of C~*(~1D_2). Analysis of band structures due to transitions from the A~2Δ state of CH~* that were seen in the CH~+ and C~+ REMPI spectra allowed characterization of three electronic states of CH, assigned as E~2Π, D~2Π, and F~2Σ~+, which clarifies a long-term puzzle concerning the energetics of the CH radical. Predissociation of the E, D, and F states to form C~*(~1D_2) occurs. Bromine atomic lines were observed and are believed to be associated with bromine atom formation via predissociation of CH_2Br_2 Rydberg states.
机译：记录并分析了双光子共振激发区中的CH_2Br_2在71 200〜82 300 cm〜（-1）范围内的质量分辨（2 + n）共振增强多光子电离（REMPI）光谱。光谱结构允许表征新的分子里德堡态。发现C〜*（〜1D_2）是光解离过程中的重要中间体。重新解释了在C〜+光谱中约80663 cm〜（-1）达到峰值并在相​​关研究中经常看到的宽光谱特征，并与C〜*（〜1D_2）的三光子电离和两光子电离之间的切换有关。通过分析CH〜+和C〜+ REMPI光谱中从CH〜*的A〜2Δ态跃迁引起的能带结构，可以表征CH的三个电子态，分别为E〜2Π，D〜2Π，和F〜2Σ〜+，这澄清了有关CH自由基的能量学的长期难题。发生E，D和F状态的预离解以形成C〜*（〜1D_2）。观察到溴原子线，并认为其通过CH_2Br_2 Rydberg态的预离解与溴原子形成有关。

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