Verbreiterung von Hauptserienlinien des Kaliums durch Wechselwirkung mit Kalium- und Cäsiumatomen bei hohen Teilchendichten

Impact broadening and shift of RbnS andnD levels by noble gases

“…Spectroscopic studies of the line broadening and shift of spectral series due to the interaction of highly excited atoms with neutral perturbers have been carried out by many groups during the past 47 years [1][2][3][4][5][6][7][8][9][10][11][12]. Because of convenience, the high vapour pressure of alkali metals, and the accessible spectral range, these experiments were solely concerned with the principal series lines of the alkali atoms.…”

Self-broadening of principal series lines of rubidium at high number densities and oscillator strengths

“…The influence of the thermal Doppler effect, the van der Waals-broadening by surrounding neutrals and Zeeman interaction caused by the magnetic field of the furnace were discussed in detail in [13]; satellites in the spectra pointing to molecules can be neglected in agreement with the predictions of Nesmeyanov [15]: the number density of Rb2-molecules should be only 3 ~, of the atomic density thus yielding no effect to the observed line-width.…”

“…In contrast to the absorption tube described in [13,14] the cell used in this investigation had only a length of 5.2 cm between the windows and a diameter of I cm; thus its volume was by a factor 85 smaller, favouring equilibration effects-as homogenity and the validity of vapour pressure number densities-. The absorption cell was equipped with sapphire windows; vacuum tightening of the windows against the mountings was effected by softened copper rings with cutting edges.…”

“…In contrast to foregoing publications [13,14] the rubidium atom densities were derived from the vapour pressure curve [15]; from the smaller size of the absorption-cell one might expect an negligible difference between this value and the true one, which was in [13,14] approximated by the total absorption of some lines and f-values from the literature. Assuming number densities obtained from the vapour pressure curve, besides the line-widths oscillatorstrengths for the principal series lines of rubidium can be evaluated.…”

“…In contrast to the experimental data the theoretical knowledge is rather poor, especially for lines with higher principal quantum numbers and at large densities. The behaviour of highly excited principle series lines was studied in detail in [,11-14]; in addition to the results of Schreiber et al [13] and Kusch et al [14] self-broadening half-widths of rubidium principal series lines are the goal of this publication. Vapour densities could be greatly enlarged using an improved experimental device, and carrying on the results of Schreiber et al [,13], moreover the dependence of the experimental half-widths from the oscillator strength of the corresponding line can be determined besides the well-known proportionality from number density.…”