Abstract
Zeeman shifts of the order of 10 −4 to 10 −3 of the inhomogeneous spectral linewidth have been observed in the 0-0 transition of free-base porphin embedded in amorphous polyethylene at 4.2 K by means of optical hole burning. From fits of the experimental results to calculated line shapes as a function of frequency and field strength, the value of the change in the magnetic susceptibility of the molecule in a magnetic field on excitation to the first excited singlet state, 1 2 χ z′,z′ = 60.6 MHz/T 2, was determined. This is in good agreement with the value previously found for the same molecule in a crystalline host.
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