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2008•Chinese Physics LettersRequires access

Experimental Research of Spontaneous Evolution from Ultracold Rydberg Atoms to Plasma

Linjie Zhang, Zhigang Feng, LI An-Ling, Jianming Zhao, Changyong Li, Jia Suo-Tang

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Abstract

The spontaneous evolution from ultracold Rydberg atoms to plasma is investigated in a caesium MOT by using the method of field ionization. The plasma transferred from atoms in different Rydberg states ( n = 22-32) are obtained experimentally. Dependence of the threshold time of evolving to plasma and the threshold number of initial Rydberg atoms on the principal quantum number of initial Rydberg states is studied. The experimental results are in agreement with hot-cold Rydberg–Rydberg atom collision ionization theory.

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What this paper is about

The spontaneous evolution from ultracold Rydberg atoms to plasma is investigated in a caesium MOT by using the method of field ionization. The plasma transferred from atoms in different Rydberg states ( n = 22-32) are obtained experimentally. Dependence of the threshold time of evolving to plasma and the threshold number of initial Rydberg atoms on the principal quantum number of initial Rydberg states is studied. The experimental results are in agreement with hot-cold Rydberg–Rydberg atom collision ionization theory.

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Available abstract

The spontaneous evolution from ultracold Rydberg atoms to plasma is investigated in a caesium MOT by using the method of field ionization. The plasma transferred from atoms in different Rydberg states ( n = 22-32) are obtained experimentally. Dependence of the threshold time of evolving to plasma and the threshold number of initial Rydberg atoms on the principal quantum number of initial Rydberg states is studied. The experimental results are in agreement with hot-cold Rydberg–Rydberg atom collision ionization theory.

Key concepts: Rydberg atom, Rydberg formula, Atomic physics, Rydberg matter, Principal quantum number, Plasma, Ionization, Physics

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