Closed-orbit theory and the photodetachment cross section ofH−in parallel electric and magnetic fields

1997 ◽  
Vol 56 (1) ◽  
pp. 331-344 ◽  
Author(s):  
Aaron D. Peters ◽  
Charles Jaffé ◽  
John B. Delos
Keyword(s):  
Magnetic Fields ◽  
Cross Section ◽  
Closed Orbit ◽  
Electric And Magnetic Fields ◽  
Photodetachment Cross Section ◽  
Orbit Theory ◽  
Closed Orbit Theory

scholarly journals Photodetachment spectrum of hydrogen negative ion near a spherical surface

2016 ◽  
Vol 94 (2) ◽  
pp. 226-230
Author(s):  
A. Afaq ◽  
A. Iqbal ◽  
A. Iftikhar ◽  
M. Asif
Keyword(s):  
Cross Section ◽  
Laser Light ◽  
Spherical Surface ◽  
Closed Orbit ◽  
Negative Ion ◽  
Classical Action ◽  
Zero Curvature ◽  
Photodetachment Cross Section ◽  
Orbit Theory ◽  
Closed Orbit Theory

The semi-classical closed orbit theory is applied to study photodetachment of H− near an elastic spherical surface for a z-polarized laser light. It is assumed that similar to the outgoing detached-electron waves from the source, waves propagate from an image of the source behind the surface. We then calculate the classical action for those trajectories that are perpendicular to the surface. The spherical effects in total photodetachment cross section are controlled by curvature κ of the surface. For zero curvature, our results match with the plane wall case while for a large curvature the results become the asymptotic value of the cross section recently published.

Photodetachment cross section ofH−in electric and magnetic fields with any orientation

1996 ◽  
Vol 54 (5) ◽  
pp. 4078-4090 ◽  
Author(s):  
Z. Y. Liu ◽  
D. H. Wang ◽  
S. L. Lin ◽  
W. Z. Shi
Keyword(s):  
Magnetic Fields ◽  
Cross Section ◽  
Electric And Magnetic Fields ◽  
Photodetachment Cross Section

Photodetachment of H– ion in perpendicular electric and magnetic fields near a metal surface

2014 ◽  
Vol 92 (10) ◽  
pp. 1241-1248 ◽  
Author(s):  
De-hua Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Electric Field ◽  
Metal Surface ◽  
Cross Section ◽  
Closed Orbits ◽  
Electric And Magnetic Fields ◽  
Oscillatory Structure ◽  
Photodetachment Cross Section ◽  
The Magnetic Field

The photodetachment of the H– ion in perpendicular electric and magnetic fields near a metal surface has been investigated on the basis of the semiclassical closed-orbit theory. Firstly, we give a clear physical picture of the detached electron’s movement and find out the closed orbits of this system. Then we put forward an analytical formula for calculating the photodetachment cross section. It is found that the perpendicular electric and magnetic fields can produce some interesting effects. As the magnetic field is relatively weak, the influence of the electric field and the electrostatic potential dominates and the oscillatory structure in the photodetachment cross section exhibits a smoothly oscillating curve. As we keep the electric field and the ion–surface distance unchanged, with the increase of the magnetic field strength, the number of closed orbits is increased and the oscillatory structure in the photodetachment cross section is characterized by broad Landau level envelops. Therefore, we can use the perpendicular electric and magnetic fields to control the photodetachment of H– near a metal surface. Our study may guide future experimental research on the photodetachment microscopy of negative ion in external fields near surfaces.

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