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• W1969483451 endingPage "6111" @default.
• W1969483451 startingPage "6093" @default.
• W1969483451 abstract "The spin dynamics of the generation of high nuclear spin polarization as a result of optical excitation (ONP) is studied with time resolution extending into the nanosecond range with the help of synchronized light and RF pulses. The well-characterized system-acridine doped into a crystalline fluorene matrix-has been used for the present dynamics study. With a short laser pulse, a selective sublevel population of the lowest acridine triplet state is generated. Resonant RF pulses of variable length initiate transfer of the electronic to nuclear spin polarization; the ONP-amplitude as a function of the RF pulse-length shows oscillating behaviour closely related to nutations of the electronic spins due to the resonant RF field. The ONP amplitude at the oscillation maximum is more than twice as high as the ONP level obtainable by CW RF-irradiation, which reflects an improved efficiency of the polarization transfer process. In contrast to the wide range of ONP experiments employing electron spins of stable paramagnetic systems the pulsed version of the ONP experiment permits direct time resolution of the electron nuclear cross-polarization process. In order to explain the results a two-step process is proposed and tested against the experimental data." @default.
• W1969483451 created "2016-06-24" @default.
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• W1969483451 date "1991-08-12" @default.
• W1969483451 modified "2023-10-18" @default.
• W1969483451 title "Nanosecond time resolution of electron-nuclear cross polarization within the optical nuclear polarization (ONP) process" @default.
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• W1969483451 doi "https://doi.org/10.1088/0953-8984/3/32/015" @default.
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