Theoretical studies in photoelectron spectroscopy: Use of angular distribution data to deduce molecular orbital parameters. II. Calculation the angular distributions for electrons ejected from molecules of selected symmetries

1974 ◽  
Vol 61 (8) ◽  
pp. 3279-3290 ◽  
Author(s):  
Burke Ritchie
Keyword(s):  
Angular Distribution ◽  
Molecular Orbital ◽  
Photoelectron Spectroscopy ◽  
Angular Distributions ◽  
Distribution Data ◽  
Theoretical Studies ◽  
Orbital Parameters

Positron Annihilation in Teflon and Polyethylene

1974 ◽  
Vol 52 (11) ◽  
pp. 935-939 ◽  
Author(s):  
Donald P. Kerr
Keyword(s):  
Angular Distribution ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
Gamma Rays ◽  
Momentum Distribution ◽  
Angular Distributions ◽  
Distribution Data ◽  
Lifetime Component ◽  
Considerable Uncertainty ◽  
Correlation Data

Both the time spectra and the angular distributions of the annihilation gamma rays have been measured for positrons annihilating in Teflon and polyethylene in an attempt to clarify which annihilation mechanisms account for the various lifetimes in these materials. Some authors have suggested that, in addition to the longest lifetime component, one of the shorter lived components also arises from the pickoff annihilation of orthopositronium. If this were the case, substantially more positronium would be formed than is indicated by the intensity of the longest lived component alone, and should be detectable through a measurement of the intensity of the low momentum portion of the momentum distribution obtained from the angular correlation data. In the present work, four lifetimes are apparent in the time spectra although there is considerable uncertainty in resolving the two shortest components. The angular distribution data, in both cases, yielded a low momentum component whose intensity indicates that only the longest lifetime component arises from pickoff annihilation of orthopositronium. The three shorter lifetime components are discussed.

Coulomb excitation of 133Cs with protons

1985 ◽  
Vol 63 (4) ◽  
pp. 483-487 ◽  
Author(s):  
K. P. Singh ◽  
D. C. Tayal ◽  
B. K. Arora ◽  
T. S. Cheema ◽  
H. S. Hans
Keyword(s):  
Angular Distribution ◽  
Gamma Ray ◽  
Transition Probabilities ◽  
Coulomb Excitation ◽  
Spin Assignment ◽  
Thick Target ◽  
Angular Distributions ◽  
Distribution Data ◽  
Mixing Ratios ◽  
Reduced Transition Probabilities

Protons of energy 3.2–4.2 MeV have been used to Coulomb excite the states in 133Cs. The thick-target gamma-ray yields and the angular distributions were measured using a 50 cm3 Ge(Li) detector. The measurements were used to extract the reduced transition probabilities, B (E2) and B(M1), and multipole mixing ratios (δ) for the various transitions. A spin assignment has been made to the 871.8 keV level on the basis of angular distribution data. The results obtained have been compared with those of other authors.

A Discussion on photoelectron spectroscopy - Angular distributions of photoelectrons and partial photoionization cross-sections

1970 ◽  
Vol 268 (1184) ◽  
pp. 141-146 ◽  
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Photoelectron Spectroscopy ◽  
Ionization Potentials ◽  
Experimental Arrangement ◽  
Angular Distributions ◽  
Asymmetry Coefficient ◽  
Vibrational States ◽  
The Asymmetry

An experimental arrangement is given for measuring the angular distribution of photoelectrons. The asymmetry coefficient B is found to be 0.3 for Ar, and 0.3 and 0.12 for N2 at 584 A when the residual ion core is left in its X2z and A2II states, respectively. The partial photoionization cross-sections are given for O2 at 186, 209, 247, 330, and 460 A. New ionization potentials for O2 are found at 23.5, 24.6 and 27.3 eV ± 0.3 eV. The effects of autoionizing transitions on the population of vibrational states of N+2 are illustrated.

FISSION FRAGMENT ANGULAR DISTRIBUTION IN 24Mg INDUCED REACTIONS ON 192Os AND 197Au

2008 ◽  
Vol 17 (02) ◽  
pp. 419-424 ◽  
Author(s):  
R. TRIPATHI ◽  
K. SUDARSHAN ◽  
S. SODAYE ◽  
A. GOSWAMI ◽  
A. V. R. REDDY ◽  
...  
Keyword(s):  
Statistical Theory ◽  
Angular Distribution ◽  
Fission Fragment ◽  
Coulomb Barrier ◽  
Angular Distributions ◽  
Distribution Data ◽  
Theory Analysis ◽  
Fission Fragments ◽  
Fragment Angular Distribution ◽  
Good Agreement

Angular distributions of fission fragments have been measured in 24 Mg + 192 Os and 24 Mg + 197 Au reactions at E lab = 128 MeV which is close to entrance channel Coulomb barrier. Experimental angular anisotropies were in reasonably good agreement with those calculated using the statistical theory. Analysis of the angular distribution data of the present study and of our earlier measurement in 19 F + 197 Au reaction has shown that contribution from non-compound nucleus fission in these systems is not significant.

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