Satellites of the Dipole-Forbidden Transitions to the Low-Lying 2S1/2 and 2D3/2,5/2 Excited States of K, Rb, and Cs Atoms in the Spectra of Gas-Phase Mixtures with CF4

• Published in: Journal of experimental and theoretical physics Vol. 137; no. 3; pp. 283 - 293
• Main Authors: Alekseev, V. A., Vartanyan, T. A., Pazgalev, A. S., Serdobintsev, P. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2023; Springer Nature B.V
• Subjects: Admixtures; Atoms; Cesium; Classical and Quantum Gravitation; Dipole moments; Electron transitions; Elementary Particles; Excitation spectra; Forbidden transitions; Gas mixtures; Molecules; Optical coupling; Optics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theory; Relativity Theory; Resonance lines; Rubidium; Satellites; Solid State Physics
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776123090029

The luminescence excitation spectra of the D 1 resonance line of atoms K, Rb, and Cs in gas mixtures with CF 4 are found to contain satellite transitions, which correspond to the transition of an atom to the states ( n – 1) d 2 D 3/2,5/2 and ( n + 1) s 2 S 1/2 , where n = 4, 5, and 6 for K, Rb, and Cs, respectively, with the simultaneous excitation of CF 4 molecule vibrations at the IR active mode frequency ν 3 with a quantum energy of 1283 cm –1 . These satellite transitions are A( ns 2 S 1/2 ) + CF 4 (ν 3 = 0) + h ν → A(( n – 1) d 2 D 3/2,5/2 ) + CF 4 (ν 3 = 1) and A( ns 2 S 1/2 ) + CF 4 (ν 3 = 0) + h ν → A(( n + 1) s 2 S 1/2 ) + CF 4 (ν 3 = 1), where A = K, Rb, and Cs. The appearance of an optical coupling between the upper and lower states of these asymptotically (at  → ∞) forbidden transitions is shown to be caused by the interaction of the dipole moment of the ν 3  = 1 ↔ ν 3 = 0 vibrational transition in the CF 4 molecule with the dipole moments of the electronic transitions np 2 P 1/2,3/2 ↔ ( n – 1) d 2 D 3/2,5/2 and np 2 P 1/2,3/2 ↔ ( n + 1) s 2 S 1/2 in an alkali metal atom; as a result of this interaction, the upper state of the satellite transition acquires admixtures of the A( np 2 P 1/2,3/2 )CF 4 (ν 3 = 0) resonance states.