The authors report on the room-temperature characterization of a narrow absorption signature in an organic molecular solid (α-lactose monohydrate) centered around 530GHz and having a full width at half maximum as small as 23GHz. Three different spectrometric techniques were applied, two of them (tunable photomixing and tunable frequency multiplication) having a high enough resolution (⪡100MHz) to accurately curve fit the signature and determine that it is much better described by a Lorentzian than a Gaussian function. The Lorentzian model provides an estimate of 14ps for the damping time associated with this signature.
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Brown et al. (2007) studied this question.
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