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(a) Infrared transmission spectra for typical samples prepared at ambient conditions (set A) and in atmosphere (set N). (b) Comparison of integrated luminescence of the transition versus concentration, for samples of sets A and N.
TL signal normalized by the absorbed power , as a function of the normalized lifetime parameter and linear fits expected for set A and set N [Eq. (2)]. The used was 975 nm.
(a) Fluorescence quantum efficiency for sets A and N. Closed and open symbols correspond to the results obtained by the TL method and lifetime measurements, respectively. (b) Photothermal spectra for sets A and N in the wavelength range corresponding to the absorption band (both samples with ).
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