Optical pumping in an organic crystal: quinoxaline in durene von de Groot, M.S., Hesselmann, I.A.M., Schmidt, J., van der Waals, J.H.

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Optical detection of electron resonance transitions in phosphorescent quinoxaline von Schmidt, J., Hesselmann, I.A.M., De Groot, M.S., Van der Waals, J.H.

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Paramagnetic resonance in phosphorescent aromatic hydrocarbons: V. The benzene in perdeuterobenzene crystal von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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Paramagnetic resonance in phosphorescent aromatic hydrocarbons: VI. Mesitylene in B-trimethylborazole von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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Phosphorescence and spin polarization: A preliminary report von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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Paramagnetic resonance in phosphorescent aromatic compounds: IV. Ions in orbitally degenerate states von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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Study of acetaldehyde photolysis with the spectrophone technique von Emeis, C.A., Drent, E., Farenhorst, E., Hesselmann, I.A.M., de Groot, M.S.

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Paramagnetic resonance of phosphorescent tetramethylpyrazine von de Groot, M.S., Hesselmann, I.A.M., Reinders, F.J., van der Waals, J.H.

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Electron resonance of phosphorescent benzene in a single crystal von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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Electron resonance of phosphorescent mesitylene von de Groot, M.S., Hesselmann, I.A.M., van der Waals, J.H.

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