摘要:

Stopping values of energetic ions in solids are predicted with an energy loss model which includes particle stopping due to collective excitations and binary collisions. Heavy ion stopping is predicted using experimentally determined ion effective charges. This stopping calculation is compared with experimental data from 156 papers which include ions from H to U (Z1= 1–92) in the energy region above 200 keV/amu, and targets from Li to Bi (Z2= 3–83). It is shown that the predicted stopping powers are within experimental data noise, with a standard error of about 5%.

ISSN:0033-7579    

DOI:10.1080/00337578008209171

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

A study of the primary processes in the photolysis of gaseous I-nitropropane at 22°C and 100 ± 1°C is undertaken. 1-Nitropropane undergoes a photochemical reaction giving rise to a six-member complex which produces ethylene, the major photolysis product. This is a typical intramolecular non-radical Norrish Type I1 process and is the most important primary process (1):

ISSN:0033-7579    

DOI:10.1080/00337578008209172

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Results of damage rate measurements and an isochronal annealing program from 15K up to room temperature after heavy ion irradiation of copper are reported.

ISSN:0033-7579    

DOI:10.1080/00337578008209173

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Energy deposition by atomic particles in adjacent semi-infinite, amorphous media is described using the forward form of the Boltzmann transport equation. A transport approximation to the scattering kernel, developed elsewhere, incorporating realistic energy transfer is employed to assess the validity of the commonly used isotropic-scattering and straight-ahead approximations. Results are presented for integral energy deposition rates due to a plane, isotropic and monoenergetic source in one half-space for a range of mass ratios between 0.1 and 5.0. Integral profiles for infinite and semiinfinite media are considered and the influence of reflection for different mass ratios is evaluated. The dissimilar scattering properties of the two media induce a discontinuity at the interface in the energy deposition rate the magnitude of which is sensitive to the source position relative to the interface. A comprehensive evaluation of the total energy deposited in the source free medium is presented for a range of mass ratios and source positions. An interesting minimum occurs for off-interface source locations as a function of the source-medium mass ratio, the position of which varies with the source position but is insensitive to the other mass ratio. As a special case, energy reflection and escape coefficients for semiinfinite media are obtained which demonstrates that the effect of a vacuum interface is insignificant for deep source locations except for large mass ratios when reflection becomes dominant.

ISSN:0033-7579    

DOI:10.1080/00337578008209174

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

The stopping power and energy straggling of4He+ions in gadolinium films, evaporated in vacuum, were determined using a backscattering technique in the energy range from 0.25 to 2.8 MeV. The experimental stopping power data were fitted by means of Brice's three parameter formula. The accuracy of the measurements was estimated better than ±3%. The energy loss values agree with the semi empirical calculations of Ziegler for4He+ions energies below 1.7 MeV. The energy straggling results are above the theoretical predictions of Bethe-Livingston.

ISSN:0033-7579    

DOI:10.1080/00337578008209175

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0033-7579    

DOI:10.1080/00337578008209176

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor