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...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.展开更多
基金Project supported by the funds of cooperation between University of Science and Technology of China and University of Tokyo.
文摘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.
