Atomic and Laser Spectroscopy

Theoretical modeling of resonant laser excitation of atoms in a magnetic field

“…is the Larmor precession frequency, µ B is the Bohr magneton, and g J F ( ) is the Lande gfactor either in J or F representation [10]. Equation (2) can be written in either representation, so J will be used from this point for simplicity.…”

“…where the convention of Corney [10] has been adopted for the circular basis states. Since excitation now involves three states ( 1 , 2 and 4 ), there will be nine coupled differential equations that must be solved which results in precession of the charge cloud around the quantization axis.…”

Transition probabilities of 30 Pb II lines of the spectrum obtained by emission of a laser-produced plasma

“…In the máximum, a> = 0, and for a Lorenz profile, #(0) = l/nf, where T is the FWHM of the line; a line may be considered optically thin if fe ra L < 0.05, [25], checking that the valué of the optical depth k m L in this work is not in excess of 0.02; for example 0.019 in 6660.0 Á, 0.015 in the 5608.9 Á or 0.006 in the 5042.6 Á. These valúes are less than the lower limit, confirming which the optical thin hypothesis used to be deemed valid; the Unes studied in this study are not resonant.…”

Shape of the Coherent Population Trapping Resonances Registered in Fluorescence

“…3 the measured narrow resonance widths of the four cells are plotted as function of the mean distance between two collisions with the cell walls L. The red line is the calculated resonance width (FWHM) L = 1/2πτ determined by the mean time between two collisions with the cell walls τ=L/v= 4V/Sv (Corney, 1977) where v is the mean thermal velocity, V is the volume, S is the surface area of the cell and L is the mean distance between 2 collisions with the cell walls. The time of atom-wall interaction during the collision is small enough (Bouchiat & Brossel, 1966) and is neglected.…”