Superconducting high-resolution X-ray detectors for metalloprotein L-edge spectroscopy

被引：13

作者：

Friedrich, S

Hiller, LJ

Frank, M

le Grand, JB

Mears, CA

Nideröst, B

Labov, SE

Barfknecht, AT

LeGros, M

Cramer, SP

机构：

[1] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Conductus Inc, Sunnyvale, CA 94086 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 1999年 / 101卷

关键词：

cryogenic X-ray detectors; superconducting tunnel junctions; L-edge absorption spectroscopy;

D O I：

10.1016/S0368-2048(98)00410-1

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Superconducting tunnel junctions (Sns) can be used as high-resolution energy-dispersive X-ray detectors. STJ detectors are based on the measurement of an increased tunneling current from excess charge carriers that are excited above the superconducting energy gap by the absorption of an X-ray. Nb-based STJ detectors have a theoretical energy resolution limit below 5 eV FNHM for X-ray energies below 1 keV at count rates up to 10 000 counts/s. We have developed Nb-Al-AlOx-Al-Nb X-ray detectors and operated them in a cryostat below 0.4 K in synchrotron experiments. Their resolution varies between 4.6 and 8.9 eV FWHM for X-ray energies between 0.2 and 1 keV. We present fluorescence spectra of metalloproteins and discuss the potential of Sn detectors for fluorescence-detected L-edge absorption spectroscopy of dilute samples. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：891 / 896

页数：6

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