title: Changes in plasma characteristics caused by easily ionisable elements in hollow cathode discharge emission spectrography.
abstract: The effect of several concomitant easily ionisable elements (EIE's), Li, Na, K, Rb and Cs on the line intensity of Sr II (first ionised state) and Al I and He I (atomic states) has been studied by atomic emission spectrometry (AES) hollow cathode (HCD) analysis. The spectral line intensities emitted by Sr II, Al I and He I have been measured while varying the volume of the EIE's concentrations, ranging from 0.1 mg ml to 10 mg ml. In the presence of EIE's at higher concentrations than 0.5% a considerable decrease of the line intensities of Sr II at 430.54 nm and 407.71 nm was observed, together with a gradual decrease in the line intensities of both Al I 494.40 nm and 396.15 nm, and He I 412.1 nm. It is demonstrated in the present experiments with a water-cooled HCD source that interference effects caused by EIE's are observed when the ratio of the number of gas atoms (n(g)) and atoms with low ionisation energy (n(a))n(g)/n(a)is lower than 10(12).
authors.affiliation: Department of Radiochemistry and Physics, University of Veszprém, Veszprém, 158, Hungary.
authors.forename: Z
authors.initials: Z
authors.lastname: Szilvássy-Vámos
authors.forename: A
authors.initials: A
authors.lastname: Gyódrfi-Buzási
authors.forename: Z
authors.initials: Z
authors.lastname: Pásztor