Quantum Oscillations and Polarization of Nuclear Spins in Photoexcited Triplet States

Autor:	Gerhard Link, Michail Lukaschek, Tien-Sung Lin, Gerd Kothe, Jörg-Ulrich Weidner, Tomoaki Yago
Rok vydání:	2010
Předmět:	Spins Chemistry Pulsed EPR Quantum oscillations Surfaces Coatings and Films law.invention Magnetic field Intersystem crossing law Materials Chemistry Physical and Theoretical Chemistry Atomic physics Triplet state Electron paramagnetic resonance Quantum
Zdroj:	The Journal of Physical Chemistry B. 114:14755-14762
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp103508t
Popis:	The unique physical properties of photoexcited triplet states have been explored in numerous spectroscopic studies employing electron paramagnetic resonance (EPR). So far, however, no quantum interference effects were found in these systems in the presence of a magnetic field. In this study, we report the successful EPR detection of nuclear quantum oscillations in an organic triplet state subject to an external magnetic field. The observed quantum coherences can be rationalized using an analytical theory. Analysis suggests that the nuclear spins are actively involved in the intersystem crossing process. The novel mechanism also acts as a source of oscillatory nuclear spin polarization that gives rise to large signal enhancement in nuclear magnetic resonance (NMR). This opens new perspectives for the analysis of chemically induced dynamic nuclear polarization in mechanistic studies of photoactive proteins.
Databáze:	OpenAIRE
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