Angular distribution and intensity in molecular photoelectron spectroscopy I. General theory for diatomic molecules

1997 ◽  
pp. 245-255
Author(s):  
A.D. BUCKINGHAM ◽  
B.J. ORR ◽  
J.M. SICHEL
Keyword(s):  
Angular Distribution ◽  
General Theory ◽  
Photoelectron Spectroscopy ◽  
Diatomic Molecules

A Discussion on photoelectron spectroscopy - Angular distributions and intensity in molecular photoelectron spectroscopy I. General theory for diatomic molecules

1970 ◽  
Vol 268 (1184) ◽  
pp. 147-157 ◽  
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Photoelectron Spectroscopy ◽  
Diatomic Molecules ◽  
Dipole Moments ◽  
Incident Light ◽  
Anisotropy Parameter ◽  
Polarization Vector ◽  
Central Field ◽  
Transition Dipole

A theory of the angular distribution of photoelectrons ejected with a given energy from diatomic molecules is presented. The differential cross-section OO is of the form a = ^ [l+ /JP ,(co»® )] where O Total is the total cross-section, B an anisotropy parameter and O the angle between the polarization vector of the incident light and the direction of the photoelectron. Expressions for O total and B in terms of internal transition dipole moments are obtained for transitions between individual rotational states of the molecule and ion, for either of Hund’s cases (a) or (b) . The formulae have been developed for central-field bases for the eigenstates of the electron before and after ionization. When rotational structure in the photoelectron spectrum is unresolved the angular distribution is independent of the choice of Hund’s case

Evidence for the Photoemission Nature of Gd 4f Resonant Photoemission

1998 ◽  
Vol 524 ◽  
Author(s):  
S. R. Mishra ◽  
T. R. Cummins ◽  
W. J. Gammon ◽  
G. D. Waddill ◽  
G. Van der-Laan ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Photon Energy ◽  
Photoelectron Spectroscopy ◽  
Emission Cross Section ◽  
Linear Dichroism ◽  
Constructive Interference ◽  
Resonant Photoemission ◽  
Magnetic Linear Dichroism ◽  
Spectroscopy Experiment

ABSTRACTThe constructive interference between direct and indirect channels above the absorption threshold of a core level leads to a massive increase in the emission cross section leading to a phenomenon called “resonant photoemission”. Using novel magnetic linear dichroism in angular distribution photoelectron spectroscopy experiment we have tried to understand the nature of the resonant photoemission process in Gd metal. The presence of dichroism in Gd 4f photoemission intensity at a photon energy corresponding to resonant photoemission clearly demonstrates the photoemission-like nature of the resonant photoemission process.

Autoionization in diatomic molecules studied by photoelectron spectroscopy

1971 ◽  
Vol 11 (12) ◽  
pp. 1839-1852 ◽  
Author(s):  
J.L. Bahr ◽  
A.J. Blake ◽  
J.H. Carver ◽  
J.L. Gardner ◽  
Vijay Kumar
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diatomic Molecules

MAGNETIC DICHROISM UNDER EXCITATION BY UNPOLARIZED RADIATION

1997 ◽  
Vol 04 (05) ◽  
pp. 919-922 ◽  
Author(s):  
A. FANELSA ◽  
R. SCHELLENBERG ◽  
F. U. HILLEBRECHT ◽  
E. KISKER
Keyword(s):  
Angular Distribution ◽  
Geometric Structure ◽  
Photoelectron Spectroscopy ◽  
Emission Angle ◽  
X Rays ◽  
Strong Variation ◽  
X Ray ◽  
Photoelectron Diffraction ◽  
Magnetic Dichroism ◽  
Unpolarized Radiation

Magnetic dichroism has been observed in the angular distribution of p-core level photoemission spectra excited from crystalline ferromagnets by unpolarized X-rays. The angular dependence of the angular and energy-resolved photoemission intensity was recorded as a function of the emission direction with respect to the crystal, revealing a strong variation of the magnetic dichroism with emission angle due to photoelectron diffraction. This variation is particularly strong around the forward scattering peaks, including sign reversals close to these directions. The results demonstrate that any standard X-ray photoelectron spectroscopy apparatus possesses the potential for combined analysis of surface magnetic structure and geometric structure in a chemically specific way.

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