Open AccessPhotodissociation study of N2O+（A2Σ+） ions
Author(s) -
徐海峰,
李奇峰,
周晓国,
戴静华,
刘世林,
马兴孝
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.1759
Subject(s) - ion , atomic physics , ionization , excited state , excitation , dissociation (chemistry) , photodissociation , molecule , spectrometer , range (aeronautics) , wavelength , materials science , physics , chemistry , optics , photochemistry , quantum mechanics , composite material
Pure parent ions, N2O+, populated at X2Π(000), were prepared by (3+1) multiphoton ionization of jet cooled N2O molecules at 360.55nm, and then were excited to different vibrational levels of predissociative A2Σ+ state by another laser in the wavelength range of 275—328nm. The total released translational energies 〈ET〉 at different excitation energies were measured with a time of flight (TOF) spectrometer from the TOF broadenings of the NO+ fragment.The 〈ET〉value drops abruptly from 8000cm-1 to 1600cm-1 at excitation energy of 32000cm-1.Further analysis shows that at the excitation energies below 32000cm-1, the dissociation channel is NO+(X1Σ+)+N(4S), and at the energies above 32000cm-1 a new channel, NO+(X1Σ+)+N(2D), is opened and replaces completely the N(4S) channel. The predissociation mechanism of the N2O+(A2Σ+) ions was discussed based on the experimental results.