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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Two-dimensional (2+ n) REMPI of CH_3Br: Photodissociation channels via Rydberg States
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Two-dimensional (2+ n) REMPI of CH_3Br: Photodissociation channels via Rydberg States

机译：CH_3Br的二维（2+ n）REMPI：通过里德堡态的光解离通道

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摘要

(2+n) resonance enhanced multiphoton ionization (REMPI) spectra of CH _3Br for the masses H~+, CH_m~+, ~iBr~+, H~iBr~+, and CH_m~iBr~+ (m = 0-3; i = 79, 81) have been recorded in the 66000-81000 cm~(-1) resonance energy range. Signals due to resonance transitions from the zero vibrational energy level of the ground state CH _3Br to a number of Rydberg states [ω_c]nl;ω (ω_c = 3/2, 1/2; ω = 0, 2; l = 1(p), 2(d)) and various vibrational states were identified. C(~3P) and C(~1D) atom and HBr intermediate production, detected by (2+1) REMPI, most probably is due to photodissociation of CH_3Br via two-photon excitations to Rydberg states followed by an unusual breaking of four bonds and formation of two bonds to give the fragments H_2 + C/C* + HBr prior to ionization. This observation is supported by REMPI observations as well as potential energy surface (PES) ab initio calculations. Bromine atom production by photodissociation channels via two-photon excitation to Rydberg states is identified by detecting bromine atom (2+1) REMPI.
机译：CH_3Br对质量H〜+，CH_m〜+，〜iBr〜+，H〜iBr〜+和CH_m〜iBr〜+的（2 + n）共振增强多光子电离（REMPI）光谱（m = 0-3 ; i = 79，81）已记录在66000-81000 cm〜（-1）共振能量范围内。由于共振而产生的信号从基态CH _3Br的零振动能级跃迁到许多Rydberg态[ω_c] nl;ω（ω_c= 3/2，1/2;ω= 0，2; l = 1（ p），2（d））和各种振动状态被确定。由（2 + 1）REMPI检测到的C（〜3P）和C（〜1D）原子以及HBr中间产物很可能是由于CH_3Br的光解离是通过双光子激发到Rydberg态，随后四个键异常断裂在离子化之前形成两个键，得到片段H_2 + C / C * + HBr。 REMPI观测以及势能面（PES）从头算起都支持该观测。通过检测溴原子（2 + 1）REMPI，可以确定光解离通道通过双光子激发到Rydberg态产生的溴原子。

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