TY - JOUR
T1 - Study on $H_3^+$ Formation by Synchrotron Radiation
AU - Zhang , Qiang
AU - Cao , Maoqi
AU - Shan , Xiaobin
AU - Li , Yuquan
AU - Wang , Zhenya
AU - Sheng , Liusi
JO - Journal of Atomic and Molecular Sciences
VL - 2
SP - 148
EP - 155
PY - 2014
DA - 2014/05
SN - 5
DO - http://doi.org/10.4208/jams.042813.070213a
UR - https://global-sci.org/intro/article_detail/jams/8319.html
KW - $H^+_3$, photoionization, synchrotron radiation, ab initio calculation.
AB - <p style="text-align: justify;">A molecular beam experiment on the formation of $H^+_3$ has been carried
out by using tunable vacuum ultraviolet (VUV) synchrotron radiation. Reflectron
time-of-flight mass spectrometer is applied to detect the signal of $H^+_3.$ The ionization
energy (IE) of $H_2$ and the appearance energy (AE) of $H^+_3$ are determined to be
15.41 eV and 14.61 eV, respectively, by measurements of photoionization efficiency
(PIE) curves. Additionally, two most likely $H^+_3$ formation ways, $(H_2)2\rightarrow H^3_+ &nbsp;+H$ and $(H_2)_3 \rightarrow H^+_3 +H+H_2,$ are discussed by ab initio calculations at CCSD(T) and MP2 level
with aug-cc-pVQZ basis set and compared with the experimental result. The optimized
geometries of species involved in the dissociative photoionization channels are
also determined at MP2/aug-cc-pVQZ level.</p>