Optically Detected Electron Spin Echo Envelope Modulation on a Photoexcited Triplet State in Zero Magnetic Field—A Comparison between the Zero-Field and High-Field Limits
✍ Scribed by V. Weis; K. Möbius; T. Prisner
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 227 KB
- Volume
- 131
- Category
- Article
- ISSN
- 1090-7807
No coin nor oath required. For personal study only.
✦ Synopsis
Electron spin echo envelope modulation (ESEEM) has been stud- imposed (3, 4). Since commercial pulsed EPR spectromeied at zero and low magnetic fields (B °100 G) by means of ters normally operate at X-band frequencies (8-10 GHz), optically detected magnetic resonance. Qualitative differences of the most of the studies have been performed at magnetic fields ESEEM effect for an electronic triplet state (S Å 1) under lowof about 3000 G. field and high-field conditions are observed and discussed. They are At zero magnetic field, EPR on systems with S ¢ 1 is related to the different properties of the total spin angular momenpossible because the magnetic dipolar interaction between tum operator S ˆand the hyperfine interaction at zero and high magthe electrons lifts the degeneracy of the spin state. Whereas netic field. The novel method was applied to the photoexcited triplet ESEEM at high magnetic field is a widely used tool for state of acridine-d 9 in a fluorene-h 10 matrix. An analysis of the obdetecting nuclear transitions within an inhomogeneously served nitrogen quadrupole splitting is done by a quantitative debroadened resonance line, only a few publications exist for scription of the ESEEM effect in zero field.