Abstract
In this paper we describe a new, spectacular, unpredictable effect of the explosive evaporation of metallic Rb or K fractal clusters, only in the presence of excited atoms stimulated by resonant CW laser radiation in a heat-pipe glass cell. Evaporation occurs at low laser-power density, in the presence of a buffer gas. The effect consists of the generation of optically thick, sharply localized alkaline metals vapour clouds propagating in the cell against the laser beam. These clouds are charged and exhibit a strong luminescence of Rb or K spectral lines. We believe that the explosive evaporation of metallic fractal clusters observed is explained by the laser excitation of alkali atoms. The excited atom collides into the surface of the clusters and transfers its internal energy to the surface locally. This energy greatly raises the temperature of this local part of the clusters surface, melts it and decreases the fractal surface area. Because, in general, any fractal cluster systems have a high surface energy, some of processes which leads to decreasing their surface area can liberate the surface energy. This energy increases the total temperature of the clusters and eventually leads to the thermal explosion of the cluster.
Similar content being viewed by others
References
B.M. Smirnov, Clusters and Small Particles (Springer-Verlag, New York, Inc., 2000)
V.M. Shalaev, Optical Properties of Nanostructured Random Media. Topics in applied physics (Springer-Verlag, Berlin, Heidelberg, 2002), Vol. 82
C.R. Viadal, J. Cooper, J. Appl. Phys. 40, 3370 (1969)
See http://epjd.edpsciences.org/ for video clips, showing the movement of luminous clouds of alkaline metal vapors
S.N. Atutov et al., Phys. Rev. Lett. 87, 215002 (2001)
C.G. Granqvist, R.A. Buhrman, J. Appl. Phys. 47, 2200 (1976)
M. Born, E. Wolf, Principles of Optics (Pergamon Press, London, 1985)
G.K. Batchelor, An Introduction to Fluid Dynamics (Cambridge University Press, 2000)
G.N. Nikolaev, Zh. Eksp. Teor. Fiz. 102, 394 (2006) [Sov. Phys. JETP 102, 394 (2006)]
F. Family, D.P. Landau, Kinetics of Aggregation and Gelation (North-Holland, Amsterdam, 1984)
N.N. Semenov, Chemical Kinetics and Chain Reactions (The Clarendon Press, Oxford, 1935)
B.M. Smirnov, Sov. Phys. Usp. 34, 526 (1991)
Y. Kudriavtsev, A. Villegas, A. Godines, R. Asomoza, Appl. Surf. Sci. 239, 273 (2005)
I.M. Beterov, A.V. Eletskii, B.M. Smirnov, Sov. Phys. Usp. 31, 535 (1988)
N.A. Gorbunov, A. Grochola, P. Kruk, A. Pietruczuk, T. Stacewicz, Plasma Sources Sci. Technol. 11, 492 (2002)
S.A. Kaplan, S.B. Pikel’ner, Interstellar Medium (Cambridge University Press, Cambridge, 1982)
Author information
Authors and Affiliations
Corresponding author
Additional information
Movies are only available in electron form at www.epj.org.
Electronic supplementary material
Supplementary material, approximately 876 KB
Supplementary material, approximately 2.51 MB
Supplementary material, approximately 3.32 MB
Rights and permissions
About this article
Cite this article
Atutov, S.N., Plekhanov, A.I., Shalagin, A.M. et al. Explosive evaporation of Rb or K fractal clusters by low power CW radiation in the presence of excited atoms. Eur. Phys. J. D 66, 140 (2012). https://doi.org/10.1140/epjd/e2012-30019-3
Received:
Revised:
Published:
DOI: https://doi.org/10.1140/epjd/e2012-30019-3