Open AccessLaser‐induced fluorescence excitation spectroscopy of N 2 + produced by VUV photoionization of N 2 and N 2 O
Author(s) -
Mizutani Masakazu,
Niikura Hiromichi,
Hiraya Atsunari,
Mitsuke Koichiro
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049597015367
Subject(s) - photoionization , spectroscopy , excitation , fluorescence , analytical chemistry (journal) , fluorescence spectroscopy , laser , atomic physics , chemistry , materials science , physics , ionization , optics , ion , organic chemistry , chromatography , quantum mechanics
Synchrotron radiation emitted from the UVSOR storage ring is monochromated by a grazing‐incidence monochromator and introduced coaxially with the second harmonic of a mode‐locked Ti:sapphire laser. Sample gases, N 2 and N 2 O, are photoionized into vibronically ground N 2 + with the fundamental light of the undulator radiation at 18.0 and 18.6 eV, respectively. Laser‐induced fluorescence (LIF) excitation spectra of N 2 + from N 2 and N 2 O are measured in the laser wavelength region of the ( B 2 Σ u + , v ′ = 0) ← ( X 2 Σ g + , v ′′ = 0) transition at 389–392 nm. The LIF excitation spectra of N 2 + exhibit two maxima due to the P and R branches in which rotational bands are heavily overlapped. The rotational temperature is determined by simulating an LIF excitation spectrum by using the theoretical intensity distribution of rotation bands convoluted with the spectral width of the laser.