Modelling photoluminescence from small particles ^*

I. General formalism and a simple reference implementation

¹ INAF - Osservatorio Astronomico di Cagliari - AstroChemistry Group, Strada n.54, Loc. Poggio dei Pini, 09012 Capoterra (CA), Italy e-mail: gmulas@ca.astro.it
² Dipartimento di Fisica, Università degli Studi di Cagliari, S.P. Monserrato-Sestu Km 0.7, 09042 Cagliari, Italy
³ Astrochemical Research in Space Network
⁴ INAF, Viale del Parco Mellini 84, 00136 Roma, Italy e-mail: benvenuti@inaf.it

Corresponding author: G. Malloci, gmalloci@ca.astro.it

Received: 17 November 2003
Accepted: 23 February 2004

Abstract

We developed a general recipe able to extrapolate the expected photoluminescence of small particles starting from available laboratory results obtained on bulk samples. We present numerical results for the simplest case, namely a spherical, homogeneous dust particle, in the limit of strongly localised fluorescence. In particular, our theoretical derivation produces an explicit, analytical, dependence of the photoluminescence spectrum on the angle between the direction of observation and that of the incoming exciting light. We expect the present model to be a useful tool that will allow the study of photoluminescence phenomena of interstellar dust to move beyond the straight, plain, possibly misleading comparison with experimental data on bulk samples.