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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Analysis of low-lying gerade rydberg states of acetylene using two-photon resonance fluorescence excitation spectroscopy
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Analysis of low-lying gerade rydberg states of acetylene using two-photon resonance fluorescence excitation spectroscopy

机译：双光子共振荧光激发光谱法分析乙炔的低洼Gerade rydberg态

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The np gerade Rydberg states of acetylene were analyzed using two-photon resonance fluorescence excitation spectroscopy in the 72 000-93 000 cm ~(-1) energy region. The np~(π1) Σg~+ and np~(π1)Δ_g Rydberg series (n = 3-5) were identified in the fluorescence excitation spectrum measured by monitoring the C_2 d~3Π_g-a~3Π_u Swan system. Some vibronic bands were assigned to the npπ1Δg- X?1 Σg+ transition on the basis of rotational analysis. The 5pσ1Πgstate was observed, which is the first such observation in an npσ1Πg series. Rotational analysis of the 5pσ~1Π_g- X?~1Σg~+ transition showed e/f-symmetry dependent predissociation of acetylene in the 5pσ1Πgstate. The band of the deuterated acetylene (C_2D_2) 4p~(π1)Σ_g~+-X?~1Σ_g~+ transition exhibits an atypical structure, which was satisfactorily reproduced by a simple model of quantum interference between the discrete and quasi-continuum states. The predissociative lifetimes of the npπgerade Rydberg states were estimated from the spectral profiles. The predissociation mechanism of acetylene in the Rydberg states is discussed.
机译：在72 000-93 000 cm〜（-1）能量范围内使用双光子共振荧光激发光谱法分析了乙炔的np gerade Rydberg态。通过监测C_2 d〜3Π_g-a〜3Π_uSwan系统在荧光激发光谱中鉴定出np〜（π1）Σg〜+和np〜（π1）Δ_gRydberg级数（n = 3-5）。在旋转分析的基础上，将某些振动带分配给npπ1Δg-X？1Σg+跃迁。观察到5pσ1Πg状态，这是npσ1Πg系列中的第一个此类观察。 5pσ〜1Π_g-X？〜1Σg〜+跃迁的旋转分析表明，在5pσ1Πg态下乙炔的e / f对称性取决于离解。氘代乙炔（C_2D_2）4p〜（π1）Σ_g〜+ -X？〜1Σ_g〜+跃迁带具有非典型结构，该结构可以通过离散态和准连续态之间简单的量子干涉模型令人满意地重现。 n p gerade Rydberg态的离解寿命是从光谱轮廓估计的。讨论了在里德堡状态下乙炔的预离解机理。

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