TY - JOUR
T1 - Contribution of the 4p sublevel to the Balmer-β emission intensity from H (n=4) produced in electron-H2, CHF3, CH 4 and C3H8 collisions as studied by photon-photon coincidence experiments
AU - Furuya, Kenji
AU - Shimoida, Youhei
AU - Matsuo, Kouhei
AU - Hatano, Yoshihiko
PY - 2003/12/15
Y1 - 2003/12/15
N2 - The ratio of the Balmer-β emission intensity from the 4p sublevel to the total Balmer-β emission intensity from H(n=4) produced in electron-H2, CHF3, CH4 and C3H 8 collisions has been determined by carrying out Balmer-β-Lyman- α coincidence measurements as a function of the incident electron energy. As a result, the 4p ratio in these molecules has been found to be about 14% at an incident electron energy of 100 eV and identical in all molecules. There is a significant difference in the dependence of the 4p ratio on the incident electron energy; for example, the 4p ratio in the CHF3 case decreases to 0% at 30 and 35 eV and increases to 90% at 25 eV; in contrast, that in the C3H8 case is 0% at 37 and 40 eV and 13% at 33 eV. Such dramatic dependence cannot be explained on the basis of the Stark effect caused by stray electric fields and by the partial polarization of the Balmer-β and Lyman-α emissions. The dissociation through the neutral superexcited states of these molecules causes the dramatic dependence.
AB - The ratio of the Balmer-β emission intensity from the 4p sublevel to the total Balmer-β emission intensity from H(n=4) produced in electron-H2, CHF3, CH4 and C3H 8 collisions has been determined by carrying out Balmer-β-Lyman- α coincidence measurements as a function of the incident electron energy. As a result, the 4p ratio in these molecules has been found to be about 14% at an incident electron energy of 100 eV and identical in all molecules. There is a significant difference in the dependence of the 4p ratio on the incident electron energy; for example, the 4p ratio in the CHF3 case decreases to 0% at 30 and 35 eV and increases to 90% at 25 eV; in contrast, that in the C3H8 case is 0% at 37 and 40 eV and 13% at 33 eV. Such dramatic dependence cannot be explained on the basis of the Stark effect caused by stray electric fields and by the partial polarization of the Balmer-β and Lyman-α emissions. The dissociation through the neutral superexcited states of these molecules causes the dramatic dependence.
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U2 - 10.1016/j.chemphys.2003.09.018
DO - 10.1016/j.chemphys.2003.09.018
M3 - Article
AN - SCOPUS:1042302172
VL - 295
SP - 229
EP - 234
JO - Chemical Physics
JF - Chemical Physics
SN - 0301-0104
IS - 3
ER -