Einstein A coefficients, oscillator strengths and lifetimes for some selected triplet–triplet transitions of N2: A comparison between theory and experiment

Abstract

Einstein A coefficients, oscillator strengths and lifetimes have been calculated by an asymptotic expansion method, introduced by Chang and Karplus, for the N 2 , B In.-A 3.I: (first positive), C 'nu-+B lJI g (second positive), W 3 Llu+2B In. (Wu-Benesch) and B 03 .I';-+B In. (infrared afterglow) band systems, using theoretical electronic transition moments, Re(r), of Yeager and McKoy. Whenever possible, comparison has been made with those calculated from the electric dipole moment functions, Re(F), which are functions of r centroids, obtained from band intensity or lifetime measurements. Excellent agreement has been obtained in the case of the second positive band system of molecular nitrogen. However, for ail other cases, conventional Re(f) functions are found to be superior to the theoretical Re(r) functions of Yeager and McKoy.

Nitrogen B3IIg .dblharw. W3.DELTA.u laser systems. Assignment and model for observed lasing lines

“…Nitrogen at 1 torr, in a 4.8-m long tube placed between two concave gold-coated mirrors, was excited by a pulsed, f IGPP Publication No. 2162. longitudinal, electric discharge (10 ps, 10-20 kV, 800-2000 A).4,15 Four groups of lasing lines were observed.4 Lines oscillated during excitation (E) pulse: group I, 24 lines; group II, 24 lines. Lines oscillated during afterglow (A): group III, 16 lines; group IV, 20 lines.…”

Colloidal Metal‐Halide Perovskite Nanoplatelets: Thickness‐Controlled Synthesis, Properties, and Application in Light‐Emitting Diodes

“…Radiative decay rate and the oscillator strength are linearly proportional to one another according to both Einstein relations and Fermi's Golden rule. [162][163][164] Thus, the increase in oscillator strength of NPls stemming from quantum and dielectric confinement effects result in induced radiative decay rate for perovskite NPls. The increased radiative decay rate further enhances the photoluminescence quantum yield (Φ) via the relation κ r /(κ r +κ nr ).…”