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Journal of Zhejiang University(Sciences Edition)

Field Ionization Multiple Thresholds for 5snd 1D 2 Rydberg States of Atom Sr.

Qiu Ji

Published Jan 1, 1999• 0 citations
OpenAlex

Abstract

Experimental determinations and theoretic calculations are respectively carried out on the field ionization thresholds at various Rydberg states of atom Sr 5snd 1D 2( n=22～27),|m|= 0,1,2. Any possible impact upon field ionization made by such factors as Stark shift of energy level in the process of field ionization, adiabatic or diabatic passage of ionization and environmental thermal radiation is discussed.

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Acta Physica Sinica•Jan 1, 1994•0 citations
Experimental determinations and theoretic calculations are respectively carried out on the field
ionization thresholds at various Rydberg states of atom Sr 5snd 1D 2( n=22～27),|m|= 0,1,2. Any
possible impact upon field ionization made by such factors as Stark shift of energy level in the
process of field ionization, adiabatic or diabatic passage of ionization and environmental thermal
radiation is discussed.
We have observed the selective ionization of the degenerate ∣mj∣|{m}_{j}|∣mj​∣ levels of sss, ppp, and ddd states of sodium in the range of nnn from 15 to 20 and have shown that atoms produced in these low-field (\ensuremath{\sim} 10 V/cm) states pass adiabatically from low-field ∣mj∣|{m}_{j}|∣mj​∣ to intermediate-field ∣ml∣|{m}_{l}|∣ml​∣ states. Experiments on the Stark manifold states in intermediate fields (\ensuremath{\sim} 1 kV/cm) and high fields (\ensuremath{\sim} 4 kV/cm) show that the ∣ml∣=0and1|{m}_{l}|=0 \mathrm{and} 1∣ml​∣=0and1 states pass adiabatically from intermediate- to high-field states and that the passage of the ∣ml∣=2|{m}_{l}|=2∣ml​∣=2 states is very nearly adiabatic. These findings suggest a general approach for predicting the threshold fields for ionization of atomic Rydberg states.
The outer electron of a Rydberg atom is so weakly bound to the atomic core that a relatively small electric field may cause the electron to be stripped from the atom. The field strength at which this ionization happens is strongly dependent on the state of the Rydberg atom. Pulsed electric field ionization serves, therefore, not only as a means by which a Rydberg atom may be efficiently detected, but also a means by which the state of the Rydberg atom may be analyzed.\nThe first observation of predominantly diabatic passage to field ionization of a non-hydrogenic Rydberg atom has resulted in an improved understanding of the adiabatic and diabatic ionization processes. The magnitudes of the various field ionization features have been measured and found to agree with theory, and by detailed analysis, it is now possible to label the various field ionization signal features with the appropriate (VBAR)m(,l)(VBAR) quantum numbers. A much better understanding of the laser excitation process, the Rydberg state production, and the response of the excited state to an increasing electric field has enabled measurement of some Rydberg fine-structure intervals, through observation of field ionization quantum beats.