TY - JOUR
T1 - Lifetimes of high Rydberg states of methyl halides
AU - Urban, Bernhard
AU - Bondybey, Vladimir E.
N1 - Funding Information:
A financial grant by the Deutsche Forschungsgemein-shaft (DFG) and generous support by the Fonds der Chemischen Industrie are gratefully acknowledged. Further, we would like to thank Ms. Sabine Kullick for her assistance.
PY - 2002/6/20
Y1 - 2002/6/20
N2 - The lifetimes of high Rydberg states of the methyl halides CH3I, CH3 Br and CH3Cl have been studied. A pulsed dye laser tuned near half the ionization energy was used, with preprogrammed field pulses, and the high Rydberg states of the compounds in selected ranges of n values were ionized after a variable delay. Plots of the electron signal versus delay yielded information about the Rydberg state lifetime. The clearest trend was found for around n = 120-160: the lifetimes of the states decreased by more than an order of magnitude from CH3I (τ ≈ 12.3 μs) through CH3Br to CH3Cl. Within the range studied, the theoretically predicted increase in lifetimes (n5 or n3) was not found, and in fact the highest group of states studied (with n > 215) exhibited for all three compounds relatively short lifetimes (≈2-3 μs), possibly due to collisional processes.
AB - The lifetimes of high Rydberg states of the methyl halides CH3I, CH3 Br and CH3Cl have been studied. A pulsed dye laser tuned near half the ionization energy was used, with preprogrammed field pulses, and the high Rydberg states of the compounds in selected ranges of n values were ionized after a variable delay. Plots of the electron signal versus delay yielded information about the Rydberg state lifetime. The clearest trend was found for around n = 120-160: the lifetimes of the states decreased by more than an order of magnitude from CH3I (τ ≈ 12.3 μs) through CH3Br to CH3Cl. Within the range studied, the theoretically predicted increase in lifetimes (n5 or n3) was not found, and in fact the highest group of states studied (with n > 215) exhibited for all three compounds relatively short lifetimes (≈2-3 μs), possibly due to collisional processes.
UR - http://www.scopus.com/inward/record.url?scp=0037142758&partnerID=8YFLogxK
U2 - 10.1080/00268970210123577
DO - 10.1080/00268970210123577
M3 - Article
AN - SCOPUS:0037142758
SN - 0026-8976
VL - 100
SP - 1925
EP - 1934
JO - Molecular Physics
JF - Molecular Physics
IS - 12
ER -