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Inelastic scattering of electron and light ion beams in organic polymers
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10.1063/1.3581120
/content/aip/journal/jap/109/9/10.1063/1.3581120
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/9/10.1063/1.3581120

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Energy loss function, ELF, in the optical limit (k = 0) of: (a) PMMA, (b) Kapton, (c) PA, and (d) P2VP as a function of the transferred energy, . Solid curves were obtained through the MELF-GOS method (as described in the text), whereas experimental data for eV were taken from different sources: (a) ⋄ (Ref. 41 ), (b) (Ref. 42 ), (c) ▽ (Ref. 43 ), and (d) ◃ (Ref. 44 ). The symbols (□) correspond to the ELF values at high transferred energies obtained from x-ray scattering factors (Ref. 46 ).

Image of FIG. 2.
FIG. 2.

(Color online) Inelastic mean free path of electrons in: (a) PMMA, (b) Kapton, (c) PA, and (d) P2VP, as a function of incident kinetic energy. Solid black and gray lines are the results from the MELF-GOS method in this work with and without the Born–Ochkur exchange correction (Ref. 53 ), respectively. Dotted lines are the results from the TPP model without exchange correction (Ref. 30 ). Dashes lines in (a), (c), and (d) are the results from Akkerman and Akkerman (Ref. 37 ) with Ashley’s exchange. Dash-dotted line in (d) is the result from Tan et al. (Ref. 51 ). with Born–Ochkur exchange. Available experimental data are presented by symbols: ⊡PMMA (Ref. 54 ), ⊠Kapton (Ref. 55 ), and PA (Ref. 58 ).

Image of FIG. 3.
FIG. 3.

(Color online) Stopping power of (a) PMMA, (b) Kapton, (c) PA, and (d) P2VP for an electron beam, as a function of incident kinetic energy. Solid black and gray lines correspond to the results obtained from the MELF-GOS method in this work with and without the Born–Ochkur exchange correction (Ref. 53 ), respectively. Dashed lines in (a), (c), and (d) are the results from Akkerman and Akkerman (Ref. 53 ) with Ashley’s exchange factor. Dash-dotted line in (d) is the result from Tan et al. (Ref. 53 ) with Born–Ochkur exchange.

Image of FIG. 4.
FIG. 4.

(Color online) Stopping power of the four organic polymers, for proton and -particle beams, as a function of incident kinetic energy: (a) PMMA, (b) Kapton, (c) PA, and (d) P2PV. Solid lines are the results obtained in this work with the MELF-GOS method. Symbols represent experimental data (only available for Kapton): (Ref. 61 ), (Ref. 62 ), ⊡ (Ref. 63 ), (Ref. 64 ) ⋄ (Ref. 65 ) and (Ref. 67 ). Other calculations are also shown: dashed lines from SRIM code (Ref. 68 ), dash-dot-dotted lines from ICRU (Ref. 50 ), and dash-dotted lines from Akkerman and Akkerman (Ref. 35 ).

Image of FIG. 5.
FIG. 5.

(Color online) Energy-loss straggling calculated with the MELF-GOS method in this work for (a) proton and (b) -particle beams interacting with: PMMA (solid line), Kapton (dashed line), PA (dash-dotted line), and P2VP (dash-dot-dot line). Horizontal lines represent the Bohr straggling for each polymer, as indicated by the respective labels.

Tables

Generic image for table
Table I.

Properties of the polymers studied in this work.

Generic image for table
Table II.

Parameters used to fit the outer electronic excitations through Eq. (3) .

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Table III.

Mean excitation energy I (eV) of the four polymers, obtained by several methods.

Generic image for table
Table IV.

Parameters used to apply Eq. (6) to the four polymers discussed in this work.

Generic image for table
Table V.

Parameters used in Eq. (8) to fit our calculated S for the four polymers studied in this work.

Generic image for table
Table VI.

Bohr straggling for protons and -particles for the four polymers studied in this work.

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/content/aip/journal/jap/109/9/10.1063/1.3581120
2011-05-03
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Inelastic scattering of electron and light ion beams in organic polymers
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/9/10.1063/1.3581120
10.1063/1.3581120
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