【摘要】 在H2和的三光子共振增强多光子电离光谱中观察到反常压力现象，其中有些是首次报导的．线移、线展宽、线分裂和光谱强度的负压效应都可以用三次谐波再吸收的机理解释．用考虑了相位区配条件导出的近似表达式计算的不同压力下线移、线分裂、光谱强度与实验结果一致．用新设计的串联二对电极的气体池得到的光谱直接证明了三次谐波再吸收的机理，圆偏振光实验无信号也支持上述机理．更多还原

【Abstract】 The three-photon resonant ionization spectroscopy of H2 B1 (12,0) and(2,0) exhibits abnormal pressure effects. Some of them are observed for the firsttime. Pressure-induced abnormal line shift, line broadening, line splitting and spectral intensityvariations can be well explained by a mechanism of reabsorption of the third harmonic generation in the medium. Approximate expressions considering the phase matching requirement yieldlineshifts, -splitting and -intensities at different pressures in good agreement with the experimentalresults. Two similar spectra are detected by two tandem electrode pairs in a gas celll which giveexperimental evidence for THG reabsorption mechanism. The failure to obtain ion signal fromcircularly polarized light also supports the above mechanism.更多还原