Quenching of Symmetry Breaking in Resonant Inelastic X-Ray Scattering by Detuned Excitation

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.5035· OSTI ID:404076

Skytt, P; Glans, P; Guo, J; Gunnelin, K; Sathe, C; Nordgren, J; Gelmukhanov, F; Cesar, A; Agren, H ^[1]

---

1. Department of Physics, Uppsala University, Box 530, S-75121 Uppsala (Sweden)

Observations made in oxygen {ital K} emission of CO{sub 2} show that the symmetry selective character of resonant x-ray emission is excitation energy dependent. Electronically dipole forbidden O {ital K} emission lines are observed for excitation at the O 1{ital s}{r_arrow}{pi}{sup {asterisk}} resonance, and they are gradually reduced upon detuning the excitation energy below threshold. The occurrence of forbidden transitions is explained in terms of dynamical symmetry breaking due to vibronic coupling, and the observation of quenching of the symmetry breaking upon detuning as due to an effective quenching of this vibronic coupling. Scattering theory applied to a few-level system is shown to account for the energy dependence of the symmetry selection in the limit of narrow bandpass photon excitation. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 404076
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARBON DIOXIDE
ENERGY DEPENDENCE
EXCITATION
INELASTIC SCATTERING
QUENCHING
SYMMETRY BREAKING
X-RAY EMISSION ANALYSIS