Open AccessSpectroscopic studies of molecular ions and their dissociation dynamics by the threshold photoelectron-photoion coincidence
Author(s) -
Tang Xiao-Feng,
Mingli Niu,
Xin Zhou,
Shilin Liu
Publication year - 2010
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.59.6940
Subject(s) - photoelectric effect , atomic physics , ionization , dissociation (chemistry) , ion , spectral line , mass spectrometry , kinetic energy , coincidence , spectrometer , photoionization , mass spectrum , materials science , analytical chemistry (journal) , physics , chemistry , optics , medicine , alternative medicine , pathology , optoelectronics , quantum mechanics , astronomy , chromatography
In a recently built threshold photoelectron-photoion coincidence spectrometer, the photoelectrons and photoions were velocity-focused simultaneously to effectively improve the collection efficiency and the energy resolution. With this spectrometer we measured the threshold photoelectron spectra (TPES) and the mass-selected threshold photoelectron-photoion coincidence mass spectra (TPEPICO-MS) of NO molecules, as well as Xe/Ar/Ne rare gas mixtures. The ionization potential of NO was accurately determined, and the vibrationally resolved TPES spectra of the X1Σ+, c3Π and B1Π states of NO+ were obtained. Subsequently, the dissociation dynamics of the c3Π state of NO+ were studied by measuring the TPEPICO-MS and fitting the time-of-flight profile of the N+ fragment. The overall kinetic energy released from dissociation was determined to be 0.717 eV.