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Acta Physica Sinica

Yb原子里德伯态及价态的场电离阈

Dai Chang-Jian, Shu Xiaowu, Li Qian, Sen Zhang, Fang Da-Wei, (1)浙江大学物理系,杭州310027; (2)中国计量学院物理教研室,杭州310034

Published Jan 1, 1995• 1 citation
Publisher

Abstract

用偏振激光两步激发得到Yb原子不同|m|值的里德伯态和4f~(13)5d6s6p价态,采用脉冲场电离方法测定了6sns~1S_0(n=21—28),m=0和6snd~1D_2(n=20—27),|m|=0,1各里德伯态及4f~(13)5d6s6p价态的电离阈值。引入stark有效量子数n_s对电离阈值作了计算。对实验和计算结果作了对比分析。讨论了场电离过程中价态与里德伯态之间的相互作用及其对电离阈值的影响。

DOI
10.7498/aps.44.678

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用偏振激光两步激发得到Yb原子不同|m|值的里德伯态和4f~(13)5d6s6p价态,采用脉冲场电离方法测定了6sns1S_0(n=21—28),m=0和6snd1D_2(n=20—27),|m|=0,1各里德伯态及4f~(13)5d6s6p价态的电离阈值。引入stark有效量子数n_s对电离阈值作了计算。对实验和计算结果作了对比分析。讨论了场电离过程中价态与里德伯态之间的相互作用及其对电离阈值的影响。
We present a kinetic study of energy pooling in the equilibrium-coupled system: Ca[4s3d(1D2)]+ Mg[3s2(1S0)]⇌ Ca[4s2(1S0)]+ Mg[3s3p(3PJ)] following pulsed dye-laser excitation of both Mg(3PJ) and Ca(1D2) atoms at λ= 457.1 nm. [Mg(3P1)â†� Mg(1S0)] and λ= 457.5 nm [Ca(1D2)â†� Ca(1S0)] in the presence of helium across the temperature range 800–1100 K. Quantitative characterisation of decay profiles for Mg(3PJ) and Ca(1D2) by time-resolved emission measurements at the above wavelengths using boxcar integration indicates the effectively instantaneous establishment and maintenance of the near-resonant equilibrium under all conditions of temperature and pressure via the observed equality in the first-order decay coefficients for removal of both states. Energy pooling into some 16 higher-lying states of magnesium and calcium, including atomic levels close to the energetically accessible limit, were observed and their temporal behaviour characterised. With the exceptions of Mg[3s4s(3S1)] and Ca[4s4p(1P1)] atoms, all these pooled states exhibited first-order kinetic behaviour. Measured first-order decay coefficients for these pooled states were found to be always twice those of the energy store states, indicating their production via collisions involving the metastable states Mg(3PJ), Ca(1D2) and possibly Ca(3PJ). Initial relative populations of energy-pooled states were estimated in all cases and found to lie in the range 10–4–10–6, thus constituting a small ‘bleed-off’ from the and Ca(1D2) energy stores without disturbing the observed first-order decay of these two states in the equilibrium-coupled system.