Optical detection of spin coherence in a defect center of a molecular crystal

Kirski, T.; Stein, B.; Rothamel, F.; Borczyskowski, C. von

doi:10.1007/bf03166037

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…5 The loop-gap resonator has also been used in NMR 6 and several optically detected magnetic resonance ͑ODMR͒ investigations. 7,8 In these experiments the resonance frequency was shifted by introducing a dielectric material ͑mica plate, sapphire͒ into the gap. Unfortunately, this leads to an inhomogeneous microwave field distribution inside the resonator.…”

Section: Introductionmentioning

confidence: 99%

Probehead with interchangeable tunable bridged loop-gap resonator for pulsed zero-field optically detected magnetic resonance experiments on photoexcited triplet states

Weis¹,

Mittelbach²,

Claus³

et al. 1997

Review of Scientific Instruments

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Conventional zero-field optically detected magnetic resonance (ODMR) is normally performed by using a slow-wave helix for microwave excitation with a quality factor Q≈1. With available microwave sources this low Q factor leads to long microwave pulse lengths for coherent pulse experiments (π-pulse duration of about 300 ns for 20 W microwave excitation power). For our zero-field experiments we took advantage of the bridged loop-gap microwave resonator configuration with relatively high Q factor. Without the possibility of tuning the Zeeman energy level splitting as in electron paramagnetic resonance (EPR), in zero-field ODMR the resonator has to cover a wide range of frequencies. We are able to tune our probehead in the range of 1.9–8 GHz with a loaded Q factor of up to 800 by using interchangeable bridged loop-gap resonators of various designs. Thereby, the pulse lengths, compared to the slow-wave helix, could be reduced by nearly one order of magnitude (tresonatorπ=45 ns employing the same microwave power of 20 W). Experimental data are presented for triplet states of photoexcited acridine and benzophenone molecules at different resonance frequencies for their |Tx〉−|Tz〉 transitions (ν=2.472 GHz and ν=5.226 GHz), respectively.

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Section: Introductionmentioning

confidence: 99%

Probehead with interchangeable tunable bridged loop-gap resonator for pulsed zero-field optically detected magnetic resonance experiments on photoexcited triplet states

Weis¹,

Mittelbach²,

Claus³

et al. 1997

Review of Scientific Instruments

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“…Fluorescence excitation spectrum at 1 .7 K close to the center ofthe 01 site of Pc at 16882.8 cm1 exhibiting a statistical fine structure due to the observation of single molecules.ODMR transitions are monitored as a change in fluorescence intensity while the MW is swept slowly through resonance of the three possible spin transitions among the three spin sublevels of the first excited triplet state. Details of the principles of ODMR spectroscopy have been reported elsewhere14,15 Here it is sufficient to mention that the routes of sublevel population and depopulation (intersystem crossing) of the electric dipole-forbidden singlet-triplet conversion are strongly dependent on the symmetry of the individual states, which creates large differences among the individual intersystem crossing routes.…”

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confidence: 99%

<title>Single-spin magnetic resonance on optical unstable single molecules</title>

Wrachtrup

Borczyskowski

1995

SPIE Proceedings

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Electron spin resonance (ODMR) experiments via fluorescence excitation spectroscopy on single pentacence molecules in p-terphenyl crystals provide information on spectral jump and temperature dependent dephasing processes. It turns out that ODMR transitions in the excited triplet and optical transitions in the excited singlet state are decoupled from each other in a way that different mechanisms determine the respective spectral behaviour.

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