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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >IR-UV Double-Resonance of Methyl Radicals and a Determination of the Detection Sensitivity of REMPI Bands
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IR-UV Double-Resonance of Methyl Radicals and a Determination of the Detection Sensitivity of REMPI Bands

机译：甲基自由基的IR-UV双共振和REMPI谱带检测灵敏度的测定

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摘要

A novel method is exploited in this report to directly determine the relative detection sensitivity of the (2+1) resonance-enhanced multiphoton ionization (REMPI) bands of CH3 and CHD2 radicals. The basic idea is based on the simple fact that in an infrared (IR) absorption process the number of molecules being pumped from the lower state must be the same as the number of molecules in the excited upper state. Hence, the measured intensities of the respective REMPI bands should directly reflect their relative detection sensitivities. In order to ensure the processes involved and better quantify the measurements, extensive IR-UV double resonance spectroscopy was also performed. Using the REMPI-IR scheme, the IR spectrum of the V1 fundamental (CH stretch) of CHD2 was obtained and assigned for the first time. Using the IR-REMPI approach, high-resolution (2+1) REMPI spectra via the Rydberg 3p states of both radicals were demonstrated in a rotationally specific manner for both the origin and vibronic-excited bands, from which the predissociation rates of the Rydberg 3p states were deduced.
机译：在本报告中采用了一种新颖的方法来直接确定CH3和CHD2自由基的（2 + 1）共振增强多光子电离（REMPI）谱带的相对检测灵敏度。基本思想基于以下简单事实：在红外（IR）吸收过程中，从较低状态泵出的分子数必须与受激发的较高状态中的分子数相同。因此，各个REMPI谱带的测量强度应直接反映其相对检测灵敏度。为了确保所涉及的过程并更好地量化测量结果，还进行了广泛的IR-UV双共振光谱分析。使用REMPI-IR方案，首次获得并分配了CHD2的V1基波（CH拉伸）的IR光谱。使用IR-REMPI方法，通过两个基团的Rydberg 3p状态以旋转特定的方式展示了两个基团的高分辨（2 + 1）REMPI光谱，分别用于原始带和激振带，Rydberg的解离速率推导了3p状态。

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