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Acta Physica Polonica A

Stark-Mixing Effect on the 6p32P3/2-6p34S3/2Transition in Bi I

Jerzy Kwela

Published May 1, 1998• 0 citations
Publisher

Abstract

The 301.5 nm electric-field-induced quench radiation on a thermal beam of neutral Bi atoms in the metastable 6p3 2Ρ3/2 state for transition to the ground 6p 3 4 S3 /2 state was observed.The measurement of the Stark-enhanced intensity of the radiation as a function of the electric field yields a relationship between the field-free-decay rates for transitions between the metastable 6p 3 2P3/2 state and the nearby states that are mixed in by the field.Using the known decay rates, the measurement sets an approximate transition rate of A(6p3 2 Ρ3/2 → 6p2 7s 4 Ρ112 ) (0.50 ± 0.05) s -1 .

DOI
10.12693/aphyspola.93.685

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The 877.5-nm electric-field-induced quench radiation on a thermal beam of Ba atoms in the metastable 6s5d 1^{1}1D2{\mathit{D}}_{2}D2​ state for transition to the 5s2{\mathit{s}}^{2}s2 1^{1}1S0{\mathit{S}}_{0}S0​ ground state has been measured at the 3% precision level. The Stark-enhanced dipole radiation yields a simple relationship between the field-free-decay rates for transitions between the metastable 1^{1}1D2{\mathit{D}}_{2}D2​ state and the nearby states that are mixed in by the field. Using the known decay rates, we obtain a decay rate of A(6s6p 3^{3}3P1{\mathit{P}}_{1}P1​--6s5d 1^{1}1D2{\mathit{D}}_{2}D2​)\ensuremath{\sim}7\ifmmode\times\else\texttimes\fi{}103{10}^{3}103 ${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$.
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The interaction between a metastable H(2s) atomic hydrogen beam and an external electric field leads to the emission of the Lyman-α line. It originates in the Stark mixing of the near-degenerate 2s1/2 and 2p1/2 levels separated by the Lamb shift. The quenched radiation proportional to the square of the electric field amplitude is recovered in vacuum by using such an atomic probe beam. We observe the strong enhancement of the signal when the field is oscillating at the Lamb shift frequency. This technique is applied in a plasma, offering an alternative way to measure weak electric fields by direct and non-intrusive means.
The time-dependent theory of the Stark quenching of 2S2S2S states in hydrogen and helium is developed for high electric fields, fields for which the Stark matrix element is large compared to the state separations. The metastable 2S2S2S state of an atom is mixed with two PPP states by the field, and the subsequent decay is described.
The strong field-induced quantum beats observed in beam-foil studies of Ly- alpha radiation are obtained in a conventional metastable-hydrogen quenching experiment. The phase relation between the Stark shifted 2s 1/2 -2p 1/2 Lamb-shift oscillations and the much more rapid 2s 1 -2p 3/2 fine-structure oscillations depends on the detailed way in which the quenching field is switched on. Apart from a phaseshift, the results agree with a non-perturbative theoretical calculation which assumes that the field is applied suddenly. Various frequency components of the time-dependent radiation intensity are identified with specific hyperfine transitions or groups of transitions. No adjustable parameters are used for the initial state amplitudes.