SIO2-CHLOROPHYLL GELS UNDER HE-4 IRRADIATION

Authors
RICKARDS J GARCIA J GARCIA R RAMIREZ E LOPEZ K
Citation
J. Rickards et al., SIO2-CHLOROPHYLL GELS UNDER HE-4 IRRADIATION, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 127, 1997, pp. 691-693
Citations number
7
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
127
Year of publication
1997
Pages
691 - 693
Database
ISI
SICI code
0168-583X(1997)127:<691:SGUHI>2.0.ZU;2-Z
Abstract
SiO2 gels doped with chlorophyll extracted from natural leaves were ex posed to different fluences of a 3-MeV He-4 beam from the Institute de Fisica Pelletron Accelerator. Optical absorption, emission and excita tion spectra were measured as a function of fluence in the interval (0 -2.5) x 10(14) cm(-2). Slight increases in both emission and excitatio n spectra at small fluences were observed. For larger fluences a chara cteristic exponential-type decay was produced due to degradation of th e organic molecules. The data were fitted with a Lorentzian curve. A d iscussion of possible mechanisms is given in terms of the irradiation parameters.