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MOLECULAR LUMINESCENCE CRYOTHERMOMETER.

Author(s) : PETRIN M., MAKI A. H.

Type of article: Article

Summary

A THERMOMETER IS DESCRIBED WHICH EMPLOYS LUMINESCENCE EMITTING MOLECULAR SENSORS TO MEASURE TEMPERATURES IN THE CRYOGENIC RANGE BELOW 20 K. UPON PHOTOEXCITATION, THE MOLECULAR SENSOR EMITS LUMINESCENCE FROM AN EXCITED SPIN STATE HAVING TWO OPTICALLY RESOLVED SUBLEVELS. THE SUBLEVELS ARE IN THERMAL EQUILIBRIUM DUE TO RAPID SPIN-LATTICE RELAXATION AND THUS ACT AS A TWO-LEVEL RADIATOR WHOSE RELATIVE LUMINESCENCE INTENSITIES VARY WITH TEMPERATURE ACCORDING TO THE BOLTZMANN POPULATION EQUATION. A DEVICE IS DESCRIBED WHICH EMPLOYS PHOTON-COUNTING TECHNIQUES TO MEASURE THE INTENSITY RATIO OF THE LUMINESCENCE ORIGINATING FROM THESE TWO LEVELS AND THEN USES THIS RATIO TO CALCULATE THE TEMPERATURE OF THE SENSOR AND THEREBY OF ITS SURROUNDINGS.

Details

  • Original title: MOLECULAR LUMINESCENCE CRYOTHERMOMETER.
  • Record ID : 1987-0873
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 58 - n. 1
  • Publication date: 1987
  • Document available for consultation in the library of the IIR headquarters only.

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