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High-resolution pulsed field ionization study of high Rydberg states of benzene by A Osterwalder; S Willitsch; F Merkt is a Chemistry article available to read on EtoBox.
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The in ̄uence of dc electric ®elds and ion concentrations on the long-term stability of high Rydberg states of benzene has been studied by delayed pulsed ®eld ionization and millimeter wave spectroscopy following resonance-enhanced two-photon excitation via selected rotational levels of the uS 1 6 1 l intermediate state. The long-term stability, which is probed by applying pulsed electric ®elds at delay times of more than 1 ms after photoexcitation, originates from Stark mixing of weakly penetrating series, presumably g series, with quantum defect of approximately 0.003 with nonpenetrating high-`states. The pulsed ®eld ionization yield is strongly in ̄uenced by the experimental conditions and is characterized by a marked dependence on the principal quantum number n. At n values beyond 100, the weak stray electric ®elds in the apparatus are suf®cient to stabilize an important fraction of the optically accessible Rydberg states by Stark mixing. In the range n 40±80; long-term stability beyond 1 ms cannot be achieved by Stark mixing induced by homogeneous dc electric ®elds but can be attained by generating a suf®cient concentration of ions in the experimental volume. A simple rule c=i
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- Author
- A Osterwalder; S Willitsch; F Merkt
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2860)
- Published
- 2001
- Language
- EN
- Field
- Chemistry (Physical Sciences)