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近年来,用光声量热法(photoacoustic calorimetry,缩写PAC)测量液相体系中的光物理或光化学过程有了较快发展.这对于观测无辐射的瞬态粒子有重要意义。Peters及其同事曾分析过这种光声技术的原理.简言之,脉冲激光被体系吸收后将 相似文献
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VA族元素氢化物的紫外光解和多光子电离Ⅱ. PH3的多光子电离光谱 总被引:1,自引:0,他引:1
用染料激光器在波长为300-640 nm范围内扫描, 观察到PH_3的一系列多光子电离光谱。其中351-398 nm的近二十条谱带, 其能级间隔约263 cm~(-1), 拟归属于通过Ã态的(2+1)电离谱。在460-495 nm的弱谱, 428-452 nm的六条谱带和385-398 nm之间的四条谱带, 则分别认证为相应于经历了B, C和D态的(3+1)MPI光谱。求得B态的项值T_0≤60729 cm~(-1), D态的T_0≤75567 cm~(-1), 而D态的反演振动频率ω_2为510 cm~(-1). 相似文献
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The (3 + 1) photon ionization spectra of SiH_4 have been measured. A basically continuous spectrum was recorded in laser wavelengths from 428 to 458 nm.Two vibrational progressions were found in the UV laser region of 347-392 nm, anda fine structure of the band at 363.5 nm was assigned.The fragment ions were detected by a time-offlight mass spectrometer. No parent ion SiH_4~+ was observed whereas SiH_2~+ and SiH_3~+ were the major products. The ratio of SiH_2~+/SiH_3~+ was approximately equal to that of single photon ionization at the same energy, but the fraction of Si~+ was increased. Some additional bands appeared in Si~+ spectrum in the range of 384-390 nm implicating that the increased Si~+ might be generated from SiH_2~+ and SiH~+ ions. 相似文献
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用付里哀变换光谱仪记录了CHC1_3和CDCI_3的红外谱带并作了标识,得到大部分非谐性常数和柯里奥利常数,讨论了这两种同位素分子在CO_2激光的11μ带的光学选择性。 相似文献