LASER-INDUCED FLUORESCENCE EXCITATION SPECTROSCOPY OF N2+(X 2Σg+, v = 0) PR
ODUCED FROM N2 AND N2O BY VUV PHOTOEXCITATION ― ROTATIONAL STATE-RESOLVED S
PECTRUM

Masakazu Mizutani, Hiromichi Niikura* and Koichiro Mitsuke

Department of Vacuum UV Photoscience, Institute for Molecular Science,
Okazaki 444-8585, Japan
*The Graduate University for Advanced Studies, Okazaki 444-8585, Japan

Pump-probe experiments combining synchrotron radiation and a laser are
performed to study formation mechanism of N2+(X 2Σg+, v = 0) resulting from
VUV photoexcitation of N2 and N2O. An RF ion trap is utilized to increase
the effective number density of ions. In the case of photoionization of N2,
rotational lines of the (B 2Σu+, v' =0) ← (X 2Σg+, v" =0) transitions are
well resolved. Rotational temperatures of N2+ ions from N2 and those from
N2O are estimated to be 〜 300 K and ＜ 250 K, respectively.