Abstract
Metastable helium a 3Σ +u molecules are produced in helium nanodroplets by electron bombardment, and become attached to their surface. Photo induced electronic transitions release them, and they are subsequently detected when they eject secondary electrons upon reaching a nearby surface. We report here the first high resolution spectroscopic study of this system. It reveals a highly non-thermal rotational state distribution with N = 1 and 11 ≤ N ≤ 29 populated but with the intermediate N states missing. Further studies of the bombarding electron energy appearance threshold for the high rotational states suggest that their precursor is the atomic 23P state.
Preview
Unable to display preview. Download preview PDF.
References
H. Gunther et al. (eds.): Proceedings of the.124 th WEHeraeus-Seminar an• ions and Atoms in Super fluid Z., Phys. B 98(3) (1995)
B. Tabbert, H. Gunther et al,: J. Low Temp. Phys. 109, 653 (1997)
E.W. Becker: Z. Phys. D 3, 101 (1986) and references t herein
J. Gspann; in Physics of Electronic and Atomic Collisions, ed. by S. Datz ( North Holland, Amsterdam 1982 ) p. 79
A. Scheideman, J.P. Toennies, J.A. Northby: Phys. Rev. Lett. 64, 1899 (1990)
M. Hartmann, F. Mielke, J.P. Toennies, A.F. Vilesov, G. Benedek: Phys. Rev. Lett. 76, 4560 (1996)
F. Stienkemeier, J. Higgins, W.E. Ernst, G. Scales: Phys. Rev. Lett. 74, 3592 (1995);
F. Stienkemeier, J. Higgins, W.E. Ernst, G. Scales: Z. Phys. B 98, 413 (1995)
J.A. Northby, C. Kim, T. Jiang: Physica B 197, 426 (1994);
J.A. Northby, C. Kim, T. Jiang: Z. Phys. D 40, 119 (1997)
B.E. Callicoatt, K. Fordo, T. Ruchti, L. Jung, K.C. Janda: J. Chem. Phys. 108, 9371 (1998)
M. Firnik, U. Henne, B. Same-1in, J.P. Toennies: Z. Phys. D 40, 93 (1997)
M. Hartmann, R.E. Miller, J.P. Toennies, A. Vilesov: Phys. Rev. Lett, 75, 1566 (1995)
S. Grebenev, J.P. Toennies, A.F. Vilesov: Science 279, 2083 (1998)
J. Gspann, H. Vollmar: J. Chem, Phys. 73, 1657 (1980)
H. Buchenau, Toennies, J.A. Northby: J. Chem. Phys, 95, 8134 (1991)
J.W. Keto, F. J. Soley. 1\4, Stockton, W.A. Fitzsimmons: Phys. Rev. A 10, 872 (1974) and references therein
T. Jiang, C. Kim, J.A. Northby: Surf. Rev. Lett. 3, 377 (1996)
J.A. Northby, S. Yurgenson, C. Kim: J. Low Temp. Phys. 101, 427 (1995)
C. Kim: Ph.D. Thesis, University of Rhode Island (1997) (unpublished)
C. Kim, S. Yurgenson, C.-C. Hu, J.A. Northby: J. Low Temp. Phys. 113, 1097 (1998)
T. Jiang, S. Sun, J.A. Northby; Physics and Chemistry of Finite Systems: From Clusters to Crystals, Vol. I, ed. by P. Jena et al. ( Kluwer Academic Pubi., Netherlands 1992 ) p. 223
EOSI Model 2010
MI. Ginter: J. Chem, Phys. 42, 561 (1965)
New Focus Model 7711
A.B. Callear, R.E.M. Hedges: Nature 215, 1267 (1967);
A.B. Callear, R.E.M. Hedges: Trans. Faraday Soc. 66, 2921 (1970)
D.W. Tokaryk, RI. Brooks, J.L. Hunt: Phys. Rev. A 48, 364 (1993);
D.W. Tokaryk, G.R. Wagner, R.L. Brooks, J.L. Hunt: J. Chem. Phys, 103. 10439 (1995) and references therein
Measurements were made on the shoulders of the two curves (at 917.3 nm and at 957.3 nm) to obviate problems associated with mode hops working near the peaks
J.A. Hornbeck, J.P. Molnar: Phys, Rev. 84, 621 (1951)
H.F. Wellenstein, W.W. Robertson: J. Chem. Phys. 56, 1077 (1972);
Fröchtenicht et al. (J. Chem. Phys., 104, 2548 (1996)) also have shown that in photo excited He clusters the lowest atomic singlet state which auto ionizes is the 31P state which lies 3.3 eV above the 23S state.
J.R. Broomall, W.D. Johnson, D.G. Cnn: Phys. Rev. B 14, 2819 (1976)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1999 Springer-Verlag Italia
About this paper
Cite this paper
Yurgenson, S., Hu, CC., Kim, C., Northby, J.A. (1999). Detachment of metastable helium molecules from helium nanodroplets. In: Châtelain, A., Bonard, JM. (eds) The European Physical Journal D. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88188-6_30
Download citation
DOI: https://doi.org/10.1007/978-3-642-88188-6_30
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-88190-9
Online ISBN: 978-3-642-88188-6
eBook Packages: Springer Book Archive