Abstract
In a “crossed photon beams” experiment the action of light in a transparent medium is studied by Mössbauer resonance. Using cooled, temperature stabilized targets such as sodium nitroprusside, olivine and glasses, containing iron, no change of the hyperfine spectrum was observed by illumination with normal incoherent light of low intensity within the region of normal dispersion in agreement with the theory of optical dispersion.
There was, however, no agreement with theoretical expectation when sodium nitroprusside (whose structure is, therefore, reviewed in detail under the aspects of dispersion) was irradiated by laser light with otherwise unchanged experimental conditions, as intensity and range of wavelengths. A new kind of molecular state, producable only by polarized light, was observed. Its radiative lifetime is practically infinite, but it is thermally instable at elevated temperatures. The Mössbauer spectrum reveals a quadrupole splittingΔE Q= (+)(2.7357±0.0040)mm/s and an isomer shiftδ=}-(0.183±0.006)mm/s (relativ to Fe(Pd)) at 100 K, markedly different from the normal groundstate. In the new state the axial symmetry, the sign of thez-component, and the three principal tensor axes of the electric field gradient at the Fe central atom coincide within the experimental limits of error with those of the groundstate.
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Special thanks are due to Prof. S. Haussühl for having supplied us with single crystals. Further, we thank Prof. W. Neuwirth for interesting discussions.
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Hauser, U., Oestreich, V. & Rohrweck, H.D. On optical dispersion in transparent molecular systems. Z Physik A 280, 17–25 (1977). https://doi.org/10.1007/BF01438104
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DOI: https://doi.org/10.1007/BF01438104