Lifetimes of high Rydberg states of methyl halides

Bernhard Urban; Vladimir E. Bondybey

doi:10.1080/00268970210123577

Lifetimes of high Rydberg states of methyl halides

Bernhard Urban
, Vladimir E. Bondybey

Chair of Physical Chemistry

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	1925-1934
Number of pages	10
Journal	Molecular Physics
Volume	100
Issue number	12
DOIs	https://doi.org/10.1080/00268970210123577
State	Published - 20 Jun 2002

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title = "Lifetimes of high Rydberg states of methyl halides",

abstract = "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.",

author = "Bernhard Urban and Bondybey, \{Vladimir E.\}",

note = "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.",

year = "2002",

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doi = "10.1080/00268970210123577",

language = "English",

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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 - https://www.scopus.com/pages/publications/0037142758

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 -

Lifetimes of high Rydberg states of methyl halides

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