Molecular thermometer for cryogenic range based on Pd-porphin phosphorescence

A. Starukhin

doi:10.1117/12.753354

9 July 2007 Molecular thermometer for cryogenic range based on Pd-porphin phosphorescence

A. Starukhin

Proceedings Volume 6733, International Conference on Lasers, Applications, and Technologies 2007: Environmental Monitoring and Ecological Applications; Optical Sensors in Biological, Chemical, and Engineering Technologies; and Femtosecond Laser Pulse Filamentation; 673320 (2007) https://doi.org/10.1117/12.753354
Event: International Conference on Lasers, Applications, and Technologies '07, 2007, Minsk, Belarus

Abstract

In this paper we report on the possibility to design the luminescent molecular thermometer for the cryogenic temperatures. The approach is based on the high temperature sensitivity of the Pd-porphin phosphorescence in n-alkane matrices. The dependence of radiative deactivation of Pd-porphin triplet states on temperature has been studied in Shpol'skii matrices in the temperature interval of 1.2-210Κ . The dramatic changes in the phosphorescence spectra were observed upon temperature rise, which were due to inclusion of the thermally activated states of Pd-porphin in the processes of radiative deactivation. At liquid helium temperature T₁→S₀ emission is observed only, and an increase in temperature leads to the activation of T_i→S₀ radiative transitions, so new additional bands appear. Activation energy E_a of these states has been measured in n-octane and n-nonane matrices. The splitting value of the lowest quasidegenerate triplet state ΔE(T₂-T₁) has been determined for both planar and distorted conformations of Pd-porphin macrocycle in noctane matrix, amounting to 40 and 57 cm^-1, respectively. The workability of dependence of Pd-porphin phosphorescent properties on temperature in the design of the molecular thermometers for the temperature range from few K up to temperatures close to the melting point of n-alkane matrix (150-200 K) was shown.

Citation Download Citation

A. Starukhin "Molecular thermometer for cryogenic range based on Pd-porphin phosphorescence", Proc. SPIE 6733, International Conference on Lasers, Applications, and Technologies 2007: Environmental Monitoring and Ecological Applications; Optical Sensors in Biological, Chemical, and Engineering Technologies; and Femtosecond Laser Pulse Filamentation, 673320 (9 July 2007); https://doi.org/10.1117/12.753354

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KEYWORDS

Phosphorescence

Plasma display panels

Matrices

Temperature metrology

Cryogenics

Liquids

Helium

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