Ionisation and excitation to Rydberg states in collisions of fully stripped ions with hydrogen atoms

1987 ◽  
Vol 20 (15) ◽  
pp. 3737-3745 ◽  
Author(s):  
C O Reinhold ◽  
C A Falcon ◽  
J E Miraglia
Keyword(s):  
Rydberg States ◽  
Hydrogen Atoms

scholarly journals Classical Dynamics of Rydberg States of Muonic-Electronic Helium and Helium-Like Ions in a Weak Electric Field: Counter-Intuitive Linear Stark Effect

Dynamics ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Eugene Oks
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Stark Effect ◽  
Rydberg States ◽  
Critical Value ◽  
Weak Electric Field ◽  
Classical Dynamics ◽  
Static Electric Field ◽  
Hydrogen Atoms ◽  
Helium Atoms

According to the existing paradigm, helium atoms and helium-like ions (hereafter, heliumic systems) in a relatively weak external static electric field do not exhibit the linear Stark effect—in distinction to hydrogen atoms and hydrogen-like ions. In the present paper we consider the classical dynamics of a muonic-electronic heliumic system in Rydberg states–starting from the concept from our previous paper. We show that there are two states of the system where the averaged electric dipole moment is non-zero. Consequently, in these states the heliumic system should exhibit the linear Stark effect even in a vanishingly small electric field, which is a counter-intuitive result. We also demonstrate the possibility of controlling the overall precession of the electronic orbit by an external electric field. In particular, we show the existence of a critical value of the external electric field that would “kill” the precession and make the electronic orbit stationary. This is another counter-intuitive result. We calculate analytically the value of the critical field and show that it is typically smaller or even much smaller than 1 V/cm.

Quantum-electrodynamic level shifts between parallel mirrors: applications, mainly to Rydberg states

1987 ◽  
Vol 410 (1838) ◽  
pp. 175-200 ◽  
Keyword(s):  
Fine Structure ◽  
Principal Quantum Number ◽  
Rydberg States ◽  
Preceding Paper ◽  
Bohr Radius ◽  
Hydrogen Atoms ◽  
Angular Momenta ◽  
Level Shifts ◽  
Explicit Formulae ◽  
Very High

Hydrogen atoms in Rydberg states (principal quantum number n ≫ 1) inserted between parallel mirrors separated by a distance L suffer level shifts now becoming measurable. The analysis in the preceding paper is applied to predict these shifts ⊿. When L < n 3 a /α ( a is the Bohr radius; α = e 2 / ħc ≈ 1/137), ⊿ is basically electrostatic (‘non-retarded’), and of order ( n / 4 / L 3 mm ) x 10 ‒6 Hz (with L expressed in millimetres). When L > n 3 a /α, ⊿ is basically radiative (‘retarded’), and of order (2/ n 2 L mm x 10 4 Hz. Fine structure and hyperfine structure are taken into account, considering the extreme cases of low orbital angular momenta ( l = 0, 1), and, more briefly, very high l (with ( n — l )/ n = O (1/ n )). Explicit formulae are given in the non-retarded régime, except for very small L , where ⊿ becomes comparable with the fine structure. In the retarded régime for low l , the requisite radial integrals are not available accurately, and only rough predictions can be made.

scholarly journals Atomic-Orbital Close-Coupling Calculations Of Electron Capture From Hydrogen Atoms Into Highly Excited Rydberg States Of Multiply Charged Ions

2011 ◽  
Author(s):  
Katharina Igenbergs ◽  
Markus Wallerberger ◽  
Josef Schweinzer ◽  
Friedrich Aumayr ◽  
Floyd D. McDaniel ◽  
...  
Keyword(s):  
Electron Capture ◽  
Atomic Orbital ◽  
Rydberg States ◽  
Multiply Charged Ions ◽  
Hydrogen Atoms ◽  
Close Coupling ◽  
Multiply Charged ◽  
Charged Ions

Microwave absorption by hydrogen atoms in high Rydberg states

1985 ◽  
Vol 32 (1) ◽  
pp. 689-691 ◽  
Author(s):  
J. N. Bardsley ◽  
B. Sundaram
Keyword(s):  
Microwave Absorption ◽  
Rydberg States ◽  
Hydrogen Atoms

Remarks on the diffuse interstellar lines

1967 ◽  
Vol 31 ◽  
pp. 91-93 ◽  
Author(s):  
G. Herzberg
Keyword(s):  
Hydrogen Atoms ◽  
Interstellar Gas

It is suggested that the diffuse interstellar lines are produced in the interstellar gas by molecules consisting of a few hydrogen atoms and one other atom, such as CH4+ or NH4. Diffuseness of the lines is assumed to result from predissociation of these molecules.

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