화학공학소재연구정보센터
Journal of Physical Chemistry A, Vol.112, No.39, 9277-9282, 2008
Infrared vacuum-ultraviolet laser pulsed field ionization-photoelectron study of CH3Br+((X)over-tilde(2)E(3/2))
By preparing methyl bromide (CH3Br) in selected rotational levels of the CH3Br((X) over tilde (1)A(1); v(1) = 1) state with infrared (IR) laser excitation prior to vacuum-ultraviolet (VUV) laser pulsed field ionization-photoelectron (PFI-PE) measurements, we have observed rotationally resolved photoionization transitions to the CH3Br+((X) over tilde E-2(3/2); v(1)(+) = 1) state, where v, and v1+ are the symmetric C-H stretching vibrational mode for the neutral and cation, respectively. The VUV-PFI-PE origin band for CH3Br+ ((X) over tilde (2) E-3/2) has also been measured. The simulation of these IR-VUV-PFI-PE and V`UV-PFI-PE spectra have allowed the determination of the v(1)(+) vibrational frequency (2901.8 +/- 0.5 cm(-1)) and the ionization energies of the origin band (85 028.3 +/- 0.5 cm(-1)) and the v(1)(+) <- V-1 = 1 band (84 957.9 +/- 0.5 cm(-1)).