The paper presents a new physical phenomenon - infrared characteristic radiation under phase transitions of the first order: crystallization from melts as well as vapors deposition and condensation. In the paper [1] this phenomenon was named the Perel’man – Tatartchenko effect. Thus, to clarify a subject, in this paper and the later, the phenomenon will be titled the PeTa (Perel’man – Tatartchenko) effect.  The PeTa effect was theoretically predicted by M. Perel’man [2, 3] and for the first time was experimentally investigated by V. Tatartchenko [4 – 6]. Here, the new theoretical results are analyzed as well as the experimental ones concerning crystallization from the melt of some substances and condensation of water vapor. A background of the PeTa effect is an assertion that, during phase transition from metastable higher energetic level (in a melt or in a vapor) to the main stable condensed lower level (in a crystal or in a liquid), the particle emits transient radiation. The radiation carries away the latent heat by characteristic frequencies photons generated under this transition. With respect to our model, the transient radiation results a "recombination" of the multi-pole and its virtual "mirror reflection" in medium. The estimated ratio of radiated energy of evaporation to the temperature boiling confirms and proves the empirical Trouton's rule applicable to many simple substances [7]. It allows an estimation of critical parameters interrelation for corresponding substances. It is postulated an appearance of transparency window for the characteristic radiation in the substances where first order phase transitions take place as well as a possibility of new effects in quantum electronics: amplification of certain frequency infrared beams in supersaturated vapors or super cooled melts. The radiation has to be taken into account during modeling of processes of crystallization and condensation. It is possible to imagine numeral applications of this phenomenon in different fields.  For instance, new types of crystallization process regulation; crystallization stimulated by the characteristic radiation; an infra-red laser based on the condensation of water vapor, or crystallization of lithium fluoride or sapphire. Formation of hailstorm clouds in the atmosphere should be accompanied intensive characteristic infra-red radiation that could be detected for process characterization and meteorological warnings.

References:

1.       Ravilious, K., 2010, 27 November. Cloud power. New Scientist, 38 – 41.

2.       Perel'man M. E., 1971. Phase transitions caused by the opening of new channels in electron–photon interactions, Physics Letters A 37, 411- 412.

3.   Perel’man, M.E., Tatartchenko,V.A., 2008. Phase transitions of the first kind as radiation processes. Physics Letters A 372, 2480–2483.

4. Tatarchenko, V.A., 1979. Appearance of distinguishing features in emission spectra during crystallization of substances transparent in the IR region. Soviet Physics - Crystallography 24, 238-239.

5.   Tatarchenko, V.A., Umarov, L.M., 1980. Infrared radiation accompanying the crystallization of sapphire. Soviet Physics - Crystallography 25, 748-749.

6.       Umarov L.M., Tatarchenko V.A., 1984. Differential spectra of crystallization radiation of alkali-metal halides, Soviet Physics - Crystallography 29, 670-673. 

7.       Trouton F.T., 1884, On Molecular Latent Heat, Phil. Mag. 18, 54 – 57.

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