Diamagnetic Raman Optical Activity of Chlorine, Bromine, and Iodine Gases

0459002 - ÚOCHB 2017 RIV DE eng J - Článek v odborném periodiku
Šebestík, Jaroslav - Kapitán, J. - Pačes, Ondřej - Bouř, Petr
Diamagnetic Raman Optical Activity of Chlorine, Bromine, and Iodine Gases.
Angewandte Chemie - International Edition. Roč. 55, č. 10 (2016), s. 3504-3508. ISSN 1433-7851. E-ISSN 1521-3773
Grant CEP: GA ČR GA13-03978S; GA ČR(CZ) GA14-00431S; GA ČR(CZ) GA16-05935S
Institucionální podpora: RVO:61388963
Klíčová slova: angular momentum theory * diamagnetic molecules * excited electronic states * magnetic field * Raman optical activity
Kód oboru RIV: CC - Organická chemie
Impakt faktor: 11.994, rok: 2016

Magnetic Raman optical activity of gases provides unique information about their electric and magnetic properties. Magnetic Raman optical activity has recently been observed in a paramagnetic gas (Angew. Chem. Int. Ed. 2012, 51, 11058; Angew. Chem. 2012, 124, 11220). In diamagnetic molecules, it has been considered too weak to be measurable. However, in chlorine, bromine and iodine vapors, we could detect a significant signal as well. Zeeman splitting of electronic ground-state energy levels cannot rationalize the observed circular intensity difference (CID) values of about 10(-4). These are explicable by participation of paramagnetic excited electronic states. Then a simple model including one electronic excited state provides reasonable spectral intensities. The results suggest that this kind of scattering by diamagnetic molecules is a general event observable under resonance conditions. The phenomenon sheds new light on the role of excited states in the Raman scattering, and may be used to probe molecular geometry and electronic structure.
Trvalý link: http://hdl.handle.net/11104/0259198