Analysis of FeI density measurements by laser induced fluorescence using a Gaussian model for the time dependence of the laser power
The density of Fe atoms produced by bombardment of a stainless steel target by Ar(+) ions was measured by laser induced fluorescence (LIF) using a tunable dye laser. The excitation transition involved was a(5)D(4) going to y(5)D(4)(o) (lambda = 302.064 nm); measurements of the fluorescence signal, from the y(5)D(4)(o) going to a(5)F(5) decay (lambda = 382.043 nm), were made by varying the laser power incident on Fe atoms by means of grey filters. An absolute calibration of the detection system allowed the determination of the number of the emitting atoms versus the incident power to be obtained. The result is found to be strongly dependent on the model for the pumping laser pulse, particularly at low incident power level. Assuming a realistic Gaussian temporal dependence for the radiation field energy flux and calculating the fraction of atoms pumped by the incident pulse, the agreement was better than that for a model assuming a square time dependence for U(v,t).
Bibliographic Reference: Report: RT/ERG/FUS/93/61 EN (1994) 15 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 199510076 / Last updated on: 1995-01-10
Original language: en
Available languages: en