H_2分子D^1Π_u态的同步辐射VUV研究
Synchrotron VUV radiation studies of the D^1Π_u State of H_2
摘要：
在两个同步辐射装置上，用不同的方法重新研究了H_2分子的3 p πD^1Π_u态。在SOLEIL同步加速器上，利用傅里叶变换光谱仪，在真空紫外波段，以高分辨率和高绝对精度记录了D^1Π_u态的吸收光谱，仅受100 K下多普勒贡献的限制。从这些测量中提取了谱线位置，特别是对于涉及^1Π_u^-态的窄共振，其精度估计为0.06 cm^{-1}。新的数据也与通过窄Q线观察到的Π^-分量的MQDT计算密切匹配。在D^1Π_u态的Λ-加倍被确定到v=17。在BESSY II同步加速器的U125/2光束线上的10 m正入射扫描单色仪，结合自制的靶室和配备各种探测器，用于解开D^1Π_u振动系列的电离、解离和分子内荧光衰减的信息。结合起来的结果给出了与D^1Π_u能级的强预离解Π_u^+宇称分量相关的特征Beutler-Fano分布的精确信息。值的参数描述的预解离宽度以及Fano-q线的形状参数的J=1和J=2的旋转状态的振动量子数的序列V=17。
英文摘要：
The 3pπD^1Π_u state of the H_2 molecule was reinvestigated with different techniques at two synchrotron installations. The Fourier-Transform spectrometer in the vacuum ultraviolet wavelength range of the DESIRS beamline at the SOLEIL synchrotron was used for recording absorption spectra of the D^1Π_u state at high resolution and high absolute accuracy, limited only by the Doppler contribution at 100 K. From these measurements line positions were extracted, in particular for the narrow resonances involving ^1Π_u^- states, with an accuracy estimated at 0.06 cm^{-1} . The new data also closely match MQDT-calculations performed for the Π^- components observed via the narrow Q-lines. The Λ-doubling in the D^1Π_u state was determined up to v=17. The 10 m normal incidence scanning monochromator at the beamline U125/2 of the BESSY II synchrotron, combined with a home built target chamber and equipped with a variety of detectors was used to unravel information on ionization, dissociation and intramolecular fluorescence decay for the D^1Π_u vibrational series. The combined results yield accurate information of the characteristic Beutler-Fano profiles associated with the strongly predissociated Π_u^+ parity components of the D^1Π_u-levels. Values for the parameters describing the predissociation width as well as the Fano-q line shape parameters for the J=1 and J=2 rotational states were determined for the sequence of vibrational quantum numbers up to v=17.
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