title: Study of paramagnetic and luminescence centers of microcline feldspar.
abstract: Microcline feldspar crystal has been analyzed in order to determine the centers suitable for use in ESR and luminescence dating. ESR measurements at RT showed the Fe3+ line, and at 77K the Si-O(-) ..X signal with g=2.0052, 2.0098 and 2.0128. TL glow peak at 157 and 300 degrees C in UV interval were observed and in the VIS range we noted peaks at 150, 280 and 340 degrees C. TL growth curve of the 340 degrees C peak could be fitted by a saturating exponential equation and can be used in TL dating. Emission curves showed band widths 1.95+/-0.09, 2.73+/-0.08 and 4.94+/-0.50 eV. Transitions from 4T1-->6A1)of Fe3+ can be associated with the 1.95 eV band and the transition from 4A1 4E(G)-->6A1(S) with 2.73 eV band.
authors.affiliation: Faculdade de Tecnologia de São Paulo, Praça Cel. Fernando Prestes, 30, 01124-060, São Paulo, SP, Brasil. tatumi@fatecsp.br
authors.forename: S H
authors.initials: SH
authors.lastname: Tatumi
authors.forename: A
authors.initials: A
authors.lastname: Kinoshita
authors.forename: M E
authors.initials: ME
authors.lastname: Fukumoto
authors.forename: L C
authors.initials: LC
authors.lastname: Courriol
authors.forename: L R P
authors.initials: LR
authors.lastname: Kassab
authors.forename: O
authors.initials: O
authors.lastname: Baffa
authors.forename: C S
authors.initials: CS
authors.lastname: Munita