Universität zu Köln

Riedesel, Svenja ORCID: 0000-0003-2936-8776, King, Georgina E., Prasad, Amit Kumar, Kumar, Raju ORCID: 0000-0001-7658-459X, Finch, Adrian A. and Jain, Mayank ORCID: 0000-0002-8942-7566 (2019). Optical determination of the width of the band-tail states, and the excited and ground state energies of the principal dosimetric trap in feldspar. Radiat. Meas., 125. S. 40 - 52. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1350-4487

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Abstract

We constrain parameters that are thought to determine thermal stability of the infrared stimulated luminescence (IRSL) signal in a suite of 13 compositionally different feldspar samples by optical probing. We focus specifically on the excited and ground state of the principal trap and the width of the sub-conduction band-tail states. Excitation spectra measured at room temperature result in approximate trap depth of about 2.04 eV and the excited state energy at 1.44 +/- 0.02 eV, irrespective of feldspar composition for the sample's measured here. Fitting the non-resonant rising continuum of the excitation spectra suggests that the width of the band-tail states accessible from the ground state of the trap (Delta E) ranges from 0.21 to 0.47 eV at room temperature between the different samples. Photoluminescence measurements are used to constrain the full sub-conduction band-tail width (Urbach width, E-u) using the excitation-energy-dependent emission (EDE), resulting in values ranging from 0.26 to 0.81 eV. While the depth of the principal trap and its main excited state seem to be independent of feldspar composition, the difference between Delta E and E-u seems to be related to sample K-content.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Riedesel, Svenja UNSPECIFIED orcid.org/0000-0003-2936-8776 UNSPECIFIED King, Georgina E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prasad, Amit Kumar UNSPECIFIED UNSPECIFIED UNSPECIFIED Kumar, Raju UNSPECIFIED orcid.org/0000-0001-7658-459X UNSPECIFIED Finch, Adrian A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jain, Mayank UNSPECIFIED orcid.org/0000-0002-8942-7566 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-146314
DOI:	10.1016/j.radmeas.2018.08.019
Journal or Publication Title:	Radiat. Meas.
Volume:	125
Page Range:	S. 40 - 52
Date:	2019
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1350-4487
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INFRARED-STIMULATED LUMINESCENCE; PHOTOSTIMULATED LUMINESCENCE; EXCITATION; ELECTRONS; THERMOLUMINESCENCE; SPECTROSCOPY; DEPTH Multiple languages Nuclear Science & Technology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14631