Note on Average Energy Loss per Ion Pair for Heavy Ions at Low Energies

1967 ◽  
Vol 22 (3) ◽  
pp. 922-922
Author(s):  
Ryutaro Ishiwari
Keyword(s):  
Energy Loss ◽  
Heavy Ions ◽  
Average Energy ◽  
Ion Pair ◽  
Low Energies

THE ENERGY LOSS, THE DETERIORATION DEPTH, AND THE LIGHT OUTPUT FOR HEAVY IONS IN ZnO:Zn

1967 ◽  
Vol 45 (12) ◽  
pp. 4039-4051 ◽  
Author(s):  
L. Hastings ◽  
A. van Wijngaarden
Keyword(s):  
Energy Loss ◽  
Heavy Ions ◽  
Light Output ◽  
Average Energy ◽  
Ion Beams ◽  
Low Energy ◽  
Energy Losses ◽  
Sufficient Energy ◽  
Low Energy Ions ◽  
Total Average

Local regions on the surface of ZnO:Zn phosphor samples were deteriorated by a large number of low-energy ions. In this manner thin films which did not luminesce under ion bombardment were prepared. The phosphor samples were then scanned across energetic ion beams with sufficient energy to traverse the thin phosphor films. By comparing the luminescent response to this ion excitation in the damaged and undamaged portions of the phosphor surface, the total average energy losses of 1H, 4He, 14N, 40Ar, and 84Kr in passing through the films were determined. It was found that the energy losses for the heavier projectiles, when compared with the energy loss of hydrogen, are appreciably smaller than the energy losses predicted by the Lindhard and Scharff theory.The deterioration depth of the phosphor under prolonged bombardment is proportional to the speed of the damaging projectiles.

Effective energy loss per electron-ion pair in proton aurora

1994 ◽  
Vol 12 (10/11) ◽  
pp. 1071-1075 ◽  
Author(s):  
B. V. Kozelov ◽  
V. E. Ivanov
Keyword(s):  
Energy Loss ◽  
Cross Sections ◽  
Proton Transport ◽  
Average Energy ◽  
Initial Energy ◽  
Ion Pair ◽  
Effective Energy ◽  
Transport Parameters ◽  
Secondary Electrons ◽  
Proton Aurora

Abstract. Effective energy loss per electron-ion pair produced, <xi>(E0), as a function of a particle's initial energy has been obtained for proton transport in the atmosphere. The influence of some transport parameters on the shape of <xi>(E0) has been studied. Comparisons with the case of electron transport and with other results were made. It has been shown that: 1. for E0>1 keV, <xi>(E0) varies within the range 30-36 eV; 2. as E0 increases the value of <xi>(E0) tries to attain an asymptotic value that is the same as for electrons (≈35 eV); 3. <xi>(E0) strongly depends on the average energy of secondary electrons, but the energy distribution of secondary electrons is not as important. The range of possible changes in <xi>(E0) associated with discrepancies in cross sections has been obtained.

scholarly journals Calculated Electronic Energy Loss of Heavy Ions at Low Energies in LR-115, Kapton, SiO2, and Al2O3 Amorphous Materials

2021 ◽  
Vol 47 (1) ◽  
pp. 17
Author(s):  
J. El Asri ◽  
O. El Bounagui ◽  
N. Tahiri ◽  
A. Chetaine ◽  
H. Erramli
Keyword(s):  
Energy Loss ◽  
Heavy Ions ◽  
Amorphous Materials ◽  
Electronic Energy ◽  
Low Energies

Average energy to produce an ion pair in gases for high energy heavy ions

2011 ◽  
Author(s):  
S. Sasaki ◽  
T. Sanami ◽  
K. Saito ◽  
K. Iijima ◽  
H. Tawara ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Average Energy ◽  
High Energy ◽  
Ion Pair

THE ENERGY LOSS OF HEAVY IONS IN ZnS:Ag IN THE keV ENERGY RANGE

1967 ◽  
Vol 45 (7) ◽  
pp. 2333-2342 ◽  
Author(s):  
L. Hastings ◽  
P. R. Ryall ◽  
A. van Wijngaarden
Keyword(s):  
Thin Films ◽  
Energy Loss ◽  
Heavy Ions ◽  
Average Energy ◽  
Ion Beams ◽  
Low Energy ◽  
Energy Losses ◽  
Sufficient Energy ◽  
Low Energy Ions ◽  
Total Average

Local spots on the surface of ZnS:Ag phosphor samples were deteriorated by a large number (~5 × 1013 ions per cm2) of low-energy ions. In this manner thin films which did not luminesce under ion bombardment were prepared. These phosphor samples were scanned across energetic ion beams with sufficient energy to traverse the thin phosphor films. By comparing the luminescent response to this ion excitation in the damaged and undamaged portions of the phosphor surface the total average energy losses of 1H, 4He, 14N, 40Ar, and 84Kr, in passing through the films, were determined. It was found that the energy losses for the heavier projectiles, when compared with the energy loss for hydrogen, are appreciably smaller than those predicted by the Lindhard and Scharff theory.

Stopping-power determination for compound by EELS

1994 ◽  
Vol 52 ◽  
pp. 948-949 ◽  
Author(s):  
David C. Joy ◽  
Suichu Luo ◽  
John R. Dunlap ◽  
Dick Williams ◽  
Siqi Cao
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Materials Science ◽  
Average Energy ◽  
Stopping Power ◽  
Accurate Information ◽  
Power Calculation ◽  
Coulomb Collisions ◽  
Electron Energy Loss

In Physics, Chemistry, Materials Science, Biology and Medicine, it is very important to have accurate information about the stopping power of various media for electrons, that is the average energy loss per unit pathlength due to inelastic Coulomb collisions with atomic electrons of the specimen along their trajectories. Techniques such as photoemission spectroscopy, Auger electron spectroscopy, and electron energy loss spectroscopy have been used in the measurements of electron-solid interaction. In this paper we present a comprehensive technique which combines experimental and theoretical work to determine the electron stopping power for various materials by electron energy loss spectroscopy (EELS ). As an example, we measured stopping power for Si, C, and their compound SiC. The method, results and discussion are described briefly as below.The stopping power calculation is based on the modified Bethe formula at low energy:where Neff and Ieff are the effective values of the mean ionization potential, and the number of electrons participating in the process respectively. Neff and Ieff can be obtained from the sum rule relations as we discussed before3 using the energy loss function Im(−1/ε).

National primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2019

2020 ◽  
pp. 8-12
Author(s):  
Alexandr V. Oborin ◽  
Anna Y. Villevalde ◽  
Sergey G. Trofimchuk
Keyword(s):  
Gamma Radiation ◽  
Energy Flux ◽  
Primary Standard ◽  
Average Energy ◽  
Ion Pair ◽  
X Rays ◽  
Exposure Rate ◽  
Ionization Chambers ◽  
Air Kerma ◽  
Air Kerma Rate

The results of development of the national primary standard of air kerma, air kerma rate, exposure, exposure rate and energy flux for X-rays and gamma radiation GET 8-2011 in 2019 are presented according to the recommendations of the ICRU Report No. 90 “Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications”. The following changes are made to the equations for the units determination with the standard: in the field of X-rays, new correction coefficients of the free-air ionization chambers are introduced and the relative standard uncertainty of the average energy to create an ion pair in air is changed; in the field of gamma radiation, the product of the average energy to create an ion pair in air and the electron stopping-power graphite to air ratio for the cavity ionization chambers is changed. More accurate values of the units reproduced by GET 8-2019 are obtained and new metrological characteristics of the standard are stated.

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