ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

11

Digitale Medien

Specific primary ionization induced by minimum ionizing electrons in CH4, C2H6, C3H8, i-C4H10, argon, dimethylether, triethylamine, and tetrakis(dimethylamino)ethylene (1993)

Malamud, G. ; Breskin, A. ; Chechik, R. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 74 (1993), S. 3645-3651

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Specific primary ionization induced by minimum ionizing electrons has been measured in several gases and vapors. Charges deposited by β-electrons in a low-pressure gas were collected, amplified by a multistep gaseous electron multiplier, and counted. The high counting efficiency of the multiplier provided results of systematically higher values as compared to existing data. The respective values of the specific primary ionization in CH4, C2H6, C3H8, i-C4H10, argon, dimethylether, triethylamine, and tetrakis(dimethylamino)ethylene are: 0.034, 0.065, 0.095, 0.12, 0.03, 0.082, 0.195, and 0.370 clusters/cm Torr. The experimental method is presented and the results and their accuracy are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.354505

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

12

Digitale Medien

Characteristics of secondary electron emission from CsI induced by x rays with energies up to 100 keV (1993)

Gibrekhterman, A. ; Akkerman, A. ; Breskin, A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 74 (1993), S. 7506-7509

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A microscopic model for low energy electron interaction in alkali halides was used to simulate secondary electron emission from CsI induced by x rays with energies up to 100 keV. The integral "current'' and "pulse'' yields were calculated as function of the x-ray energy, CsI convertor thickness, and angle of incidence. We observe a decrease in true low energy (〈50 eV) secondary electron yields at increasing x-ray energies and discuss the effectiveness of CsI convertors coupled to gaseous electron multipliers developed for fast, high resolution x-ray imaging.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.354975

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

13

Digitale Medien

Field enhancement of the photoelectric and secondary electron emission from CsI (1995)

Buzulutskov, A. ; Breskin, A. ; Chechik, R.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 77 (1995), S. 2138-2145

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We have measured the electron emission from a CsI-coated multiwire cathode, induced by ultraviolet photons and electrons, in vacuum at high electric fields. We found an enhancement in quantum efficiency of a factor of 1.5 at 160 nm, 3 at 185 nm, and 25 above 200 nm, at a field of 500 kV/cm. At the short wavelengths the amplitude of the effect is a linear function of the square root of the field strength. The enhancement of the electron-induced secondary electron emission yield is dependent on the primary electron energy: for energies above 1 keV it varies by a factor of 2 to 10. A simple model of the field enhancement of the photoemission is suggested. Practical applications are discussed. © 1995 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.358791

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

14

Digitale Medien

Spatial characteristics of electron- and photon-induced secondary electron cascades in CsI (1994)

Gibrekhterman, A. ; Akkerman, A. ; Breskin, A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 76 (1994), S. 1676-1680

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Our microscopic model for electron transport in alkali halides was used for the calculation of the spatial characteristics of secondary electron cascades induced by x rays and electrons in an infinite CsI volume, in the energy range of 5–50 keV. The results show that the shape of the cascade cloud preserves the features of the primary interactions only at the core, where the cascade has an elongated, forward peaked shape for incident electrons and is spherically symmetric for photons. At the periphery the cloud is practically spherical, and of very low electron density. The maximal cascade dimensions do not exceed 10 μm at the highest considered energy. The impact of these characteristics on secondary electron emission from finite thickness CsI layers is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.357708

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

15

Digitale Medien

An improved model for ultraviolet- and x-ray-induced electron emission from CsI (1999)

Boutboul, T. ; Akkerman, A. ; Gibrekhterman, A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 86 (1999), S. 5841-5849

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A microscopic theoretical model is proposed for calculating the characteristics of ultraviolet photoemission and x-ray secondary electron emission induced from CsI photoconverters. This approach is based on a realistic picture of the basic interactions of photons and induced electrons within the material. Both differential and integral emission characteristics, such as energy spectra and quantum efficiencies, are estimated according to the model and are found to agree, in general, with experimental data. The model-calculated photoemission enhancement under high external electric fields is also considered and is fairly compatible with measured values. The applicability of the model in the field of radiation detectors incorporating solid photoconverters is discussed. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.371601

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

16

Digitale Medien

Effect of moderate heating on the negative electron affinity and photoyield of air-exposed hydrogen-terminated chemical vapor deposited diamond (2001)

Piantanida, G. ; Breskin, A. ; Chechik, R. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 8259-8264

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The effect of moderate heating (200–300 °C) in vacuum on the photoemission from air-exposed hydrogen-terminated chemical vapor deposited diamond films was studied in the photon spectral range of 140–210 nm (8.9–5.9 eV). A three- to fivefold enhancement was observed, stable in high vacuum and in some high purity gases, but unstable in air. The surfaces were also examined by x-ray induced photoelectron spectroscopy and ultraviolet induced photoelectron spectroscopy before and after the heating process and upon exposure to air and to oxygen. The results provide good evidence that the strong dipole originating from H2O molecules absorbed on the diamond surface is responsible for the observed effect. A simple model is presented for quantitative estimation of the effect. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1368395

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

17

Digitale Medien

Evidence for thin-film protection of visible photocathodes (1996)

Breskin, A. ; Buzulutskov, A. ; Chechik, R. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 69 (1996), S. 1008-1010

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: NaI and CsI protective coatings on visible cesium-antimony photocathodes have been studied. With NaI protective films the photocathodes are shown to withstand exposure to considerable doses of oxygen and dry air. This opens the way to their handling and operation in gas media. © 1996 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.117968

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

18

Digitale Medien

Escape length of ultraviolet induced photoelectrons in alkali iodide and CsBr evaporated films: Measurements and modeling (1998)

Boutboul, T. ; Akkerman, A. ; Breskin, A. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 84 (1998), S. 2890-2896

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The escape length of electrons photoinduced from thin CsI, KI, RbI, NaI, and CsBr evaporated films was measured in the 140–180 nm photon spectral range. Theoretical model predictions of the escape length value are in fair agreement with the experimental results. They vary between 10 and 40 nm, the highest values being for CsI, RbI and CsBr. For CsI, measured and calculated ultraviolet-induced escape length values are consistent with that determined from x-ray photoemission quantum yield data. Post-evaporation annealing of the films had no major impact on the measured electron transport properties. © 1998 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.368395

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

19

Digitale Medien

Fano factor and the mean energy per ion pair in counting gases, at low x-ray energies (1997)

Pansky, A. ; Breskin, A. ; Chechik, R.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 82 (1997), S. 871-877

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The mean energy per ion-pair (Wi) and the Fano factor (F) are provided with high accuracy (2% and 3%-4%, respectively), in C2H6, C3H8, i-C4H10, CH4, DME, Ar/C2H6(20:80), Ar/i-C4H10(20:80) Ar/DME (20:80) and Ar/Xe/i-C4H10(66.6/16.7/16.7), in the x-ray energy range of 0.11–1.5 keV. These parameters were extracted from precise measurements of the number and temporal distribution of x-ray induced electrons, accompanied by extended simulations of the detection process. A decrease in these parameters with increasing x-ray energy was observed, accompanied by sharp increases at x-ray energies just above some atomic shells. The effect is discussed in relation to Auger electron emission. A Penning process in Ar/C2H6(20:80) and Ar/i-C4H10 (20:80) is observed on the basis of comparative measurements of Wi and F in these mixtures and in the pure hydrocarbons. Ways are proposed for further improving the accuracy provided by the electron counting technique to better than 1%. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.365787

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

20

Digitale Medien

Ultraviolet photoabsorption measurements in alkali iodide and caesium bromide evaporated films (1998)

Boutboul, T. ; Breskin, A. ; Chechik, R.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 83 (1998), S. 7896-7899

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Ultraviolet–photon absorption constants were measured for thin CsI, KI, RbI, NaI and CsBr evaporated films, in the 140–200 nm spectral range. The constant measured for CsI is consistent with literature data; the absorption data for the other materials are given here for the first time. The absorption lengths for all materials investigated vary between 10 and 40 nm. Post-evaporation thermal treatment of the films, known to enhance the photoemission properties of CsI, NaI and CsBr films, had no effect on their photoabsorption properties. © 1998 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.367967

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext