Page Contents:
Research Overview
Staff Members
Lecture Courses
Main Publications
Research Overview
Laboratory of theoretical physics
was founded at the Institute of Physics of Latvian Academy of Sciences
by Dr. V.Veldre (1926-1967) in 1958. From 1968 to 1992 the head of laboratory
was Dr. R.Damburg.
Starting from sixties papers
of members of laboratory have been published mainly in European Journal
of Atomic Physics B: Atomic, Molecular and Optical Physics. For more than
30 years Laboratory is well known by the international community of atomic
physicists as " Riga group".
At laboratory have worked
R.Peterkop (1930-1991) and M.Gailitis (1935-1993). Their papers on Wanier
law (threshold law) and on the close coupling methods in electron atom
collisions were between the first in this field and are well known by international
community.
Laboratory with assistance
of physicists from the University of Latvia has organized two international
conferences:
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ICAP VI (VI international Conference on Atomic Physics,
Riga 17-22 July 1978). Chair of local organizing committe R.Damburg
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ECAMP IV (IV European Conference on Atomic Physics,
Riga 6-10 April 1992). Chair of local organizing committe: E.Karule
Laboratory of Theoretical Physics
was moved to the Institute of Atomic Physics and Spectroscopy at the University
of Latvia at the 1st of January 1994.
Staff Members
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Prof. Erna Gailite-Karule Head
of the laboratory, tel.: +371-7229747, fax: +371-7820113, karule@latnet.lv
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Prof. Imants Bersons
Tel.: +371-7229747, fax: +371-7820113, bersons@latnet.lv,
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Prof. Robert Damburg
Tel.: +371-7229747, fax: +371-7820113, damburg@latnet.lv
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Prof. Agris Gailitis
Tel.: +371-2944700, fax: +371-7901214, gailitis@sal.lv
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Dr. Bernards Baranovskis Tel.:
+371-7229747, fax: +371-7820113, damburg@latnet.lv
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PhD student Arturs Kulsh Tel.:
+371-7229747. arturs@latnet.lv
Lecture Courses
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Quantum electrodynamics.
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Nonlinear equations and solitons.
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Atomic theory. Hydrogen atom.
Main Publications
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R.K.Peterkop "Theory of ionization of atoms by electron impact” Colorado
associated University press, Boulder, Colorado 1977. Originally published
by Zinatne Publishing House Riga, USSR 1975.
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R. Damburg, R.Peterkop "Excitation of Hydrogen by Electron Collisions Allowing
for Excange and 1s-2s-2p Strong Coupling”, Proc. Phys. Soc. v.80; 1962;
2p.
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R. Damburg, R.Peterkop "Application of the Multichannel Effective Range
Theory to Electron Hydrogen Scattering; Proc. Phys. Soc.”, v.80; 1962;
6p.
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M.Gailitis , R.Damburg; The Influence of Close Coupling on Theshold Behaviour
of Cross Sections of Electron-Hydrogen Scattering; Proc. Phys. Soc. v.82;
1962; 10p.
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R.Damburg, M.Gailitis; Calculation in the Vicinity of 2s, 2p Threshold
of the Cross Sections of Hydrogen Atoms by Electrons; Proc. Phys. Soc.
v.82; 1962; 5p.
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R.Damburg, M.Gailitis; Some Features of the Threshold Behavior of the Cross
Sections for Excitation of Hydrogen by Electrons Due to the Existence of
a Linear Stark Effect in Hydrogen; Soviet Physics JETP v.17; 1963; 4p.
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E.Karule "Elastic scatering of low-energy electrons by alkali atoms" Phys.
Lett. 1965, v.15, No 2, 137-138.
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E.Karule, R.Peterkop "Collisions of slow electrons with alkali atoms".
In:"Physics of Electronic and Atomic Collisions" New York, Science Bookerafters,
1965, 134-139.
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E. Karule "Elastic scatering of low-energy electrons by alkali atoms" In:
"Physics of Electronic and Atomic Collisions" New York, Science Bookerafters,
1965, 139-142.
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R.Ya.Damburg and E.M.Karule "Positron Collisions with hydrogen Atoms" In:
"Atomic Collisions" (Eds. V.Ya. Veldre, R.Ya. Damburg, R.Peterkop) Transl.,
The M.I.T Press, Massachusets institute of technology, Cambrige, Massachusets,
1966, p.40-43.
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V.Ya.Veldre and E.M.Karule "Ionization of the hydrogen atom by slow electrons"
In: "Atomic Collisions" (Eds. V.Ya. Veldre, R.Ya. Damburg, R.Peterkop)
Transl., The M.I.T Press, Massachusets institute of technology, Cambrige,
Massachusets, 1966, p.119-126.
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R.Damburg, S. Geltman; Excitation or n=2 States in H by Electrons; Phys.
Rev. Lett. v.20; 1968; 3p.
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R.Damburg, R.Propin; Uber asymptotische Entwicklungen oblater Spharoidfunktionen
und ihrer Eigenwerte; Journ. for reine und angew. Math. B233; 1968; 12p.
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R.Damburg, R.Propin; On Asymptotic Expansions of Electronic Terms of the
molecular ion H2+; Jour. Phys. B v.1; 1968; 10p.
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R.Peterkop "Asymptotic form of wave function for the ionization problem”,
in: "Physics of the one- and two- electron atoms” North Holland 1969.
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I.Bersons "Electron in the quantized field of a monochromatic electromagnetic
wave." JETP, 56, (1969) p.1627.
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R.Damburg, E.Karule "A modification of the close-coupling approximation
for e-H scattering allowing for the long-range interactions." Proc.Phys.Soc.
1967, v.90, No 3.
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E.Karule "Polarization of lithium and sodium atom resonance lines excited
by electron impact." J.Phys.B, 1970, v. 3, p. 860-864.
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E.Karule "The spin polarization and differential cross sections in the
elastic scatering of electrons by alkali metal atoms." J.Phys.B: Atom.
Mol. Phys., v.4, 1971, p.67-70.
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E. Karule. "On the evaluation of transition matrix elements for multiphoton
processes in atomic hydrogen”, J.Phys. B: Atom. Mol. Phys., v.4, 1971,
L67-L70.
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R.Damburg, R.Propin; Rotational Structure of the Inversion Spectra of Amonia;
J. Phys. B v.5; 1972; 10p.
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R.Damburg, R.Propin; The Effect of 2s-2p Close Coupling on the Cross Sections
for Excitation ot the 2p State of Hydrogen Atoms by Electrons at High Energies;
J. Phys. B v.5; 1972; 7p.
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R.Damburg; Theory for Pseudostate Expansion; VII ICPEAC Invited Papers;
North-Holland Publ. Co., Amsterdam; 1972; 16p.
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E. Karule. "Multiphoton ionization of atomic hydrogen in ground state (N16)”.
In: "Atomic processes" (in russian), Riga, Zinatne, 1975, p.5-24.
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I.Bersons "Multiphoton ionization and stimulated bremsstrahlung radiation
in the case of short-range potentials." J.Phys.B: At. Mol. Phys., v. 8
(1975), p. , 3078.
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M.Gailitis "New forms of asimptotic expansions for wavefunctions of charged-particle
scattering ”, J.Phys.B: At. Mol. Phys. v.9, 1976, p.843-854.
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R.Damburg, V. Kolosov; A Hydrogen Atom in an Uniform Electric Field; J.
Phys. B v. 9; 1976; 9p.
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E. Karule "Multiphoton ionization of atomic hydrogen" In: "Multiphoton
Processes" . Invited papers of 1st Intern. Conference on Multiphoton processes,
Rochester, N.Y. 1977, p.159-169.
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E. Karule "Two-photon ionisation of atomic hydrogen simultaneously with
one photonionisation", J. Phys. B: Atom. Mol. Phys.,1978, v.11, No 3, p.
441-447.
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R.Damburg, V. Kolosov; An Asymptotic Approach to the Stark Effect for Hydrogen;
J. Phys. B v. 11; 1978; 10p.
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R.Damburg, V. Kolosov; A Hydrjgen Atom in a Uniform Electric Field III;
J. Phys. B v. 12; 1979; 7p.
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R.Damburg, V. Kolosov; Stark Effect as a Collosional Problem; XI ICPEAC
in Tokio, Invited Papers; North-Holland; 1980; 10p.
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R.Peterkop and A.Liepinsh "Investigation of threshold behaviour of ionisation
cross sections”, J.Phys.B: At. Mol. Phys. v.14, 1981, p.4125-4135.
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R.Petrkop "On the asymptotic form of wavefunction for the ionisation problem”
J.Phys.B: At. Mol. Phys. , 1882, L751-L754.
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R.Peterkop "Oscillator strengths and excitation cross sections of samarium
atoms” Phys. Lett. 90A. No4, 1982, p.182-184.
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M.Gailitis "On the series of double-excited states for the negative H ion
below the N=3 threshold”, J.Phys.B: Atom. Molec. Phys. v.13, 1980,
L479-L483.
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I.Bersons "Quasiclassical approximation for stimulated bremsstrahlung radiation.
JETP, 80 (1981) p.1727..
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I.Bersons "Multiphoton ionization of highly excited atomic states." JETP,
83, (1982) 1276.
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M.Gailitis "The influence of finite masses on the threshold behaviour of
scattering in a three charged particle system”, J.Phys.B: Atom. Molec.
Phys. v.15, 1982, 3423-3440
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R.Damburg, V. Kolosov; Theoretical Studies of a Hydrogen Rydbergs Atoms
in Electric Field; Rydberg States of Atoms and Molecules; Cambridge University
Press; 1983; 40p.
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R.Peterkop and A.Liepinsh " Plane-wave asymptotic form in the electron-atom
ionisation problem”, J.Phys.B: At. Mol. Phys. v.18, 1985, p.2763-2775.
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J.Cizek, R.Damburg, R. Propin, S. Graffi, V. Grecchi, H. Silverstone; 1/R
Expansion for H2+ . Calculation of Expanentially Small Terms and Asymptotics;
Phys. Rev. A v.33; 1985; 42p.
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M.Gailitis "Energy partitioning in the ionisation threshold law”, J.Phys.B:
At. Mol. Phys. v.19 , 1986, L697-L700.
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E. Karule "Two-photon ionisation of excited atomic hydrogen at the photoelectric
threshold and above", J. Phys. B: Atom. Mol. Phys.,1985, v.18, No 11, p.
2207-2218.
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E. Karule. "Analytical continuation of transition matrix elements and multiphoton
above-threshold ionisation of atomic hydrogen”, J. Phys. B, v. 21, No 11
(1988) p.1997- 2014.
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Modris Gailitis and Harris J.Silverstone "On the use of asymptotic expansions”,
Theor. Chim. Acta, v.73, 1988, p. 105-114.
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M. Gailitis and N.Sakss "The form of the threshold phenomena for the excitation
of mesic atoms by electrons”, J.Phys.B: At. Mol. Phys. v.21, 1988, p.351-354.
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R.Damburg; "Hydrogen Atom in Strong Electric Field” in "Atoms in Strong
Fields”; Plenum Press; 1990; 26p.
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E. Karule "Multiphoton ionisation of atomic hydrogen by extra photons"
In: "Atomic spectra and collisions in external fields". Plenum Press, New
York, 1988, p. 409-416.
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R.Damburg, R. Propin, V. Martyshchenko; Large-order Perturbation Theory
for the O(2) Anharmonic Oscillator with Negative Anharmonicity and for
the Double-well Potential; in ”Current Physics Sources and Comments” v.7;
North-Holland; 1990; 10p.
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R.Damburg, R. Propin, S. Graffi, V. Grecchi, E. Harrell II, H. Silverstone;
1/R Expansion for H2+: Analicity, Asymptotics and Calculations of Exponentially
Small Terms; in ”Current Physics Sources and Comments” v.7; North-Holland;
1990; 4p.
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R.Damburg, R. Propin, Yu. Ryabykh; Perturbation Theory for the Triple-well
Anharmonic Oscillator; Phys. Rev. A 41; 1990; 7p.
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E. Karule. "Above-threshold ionization of atomic hydrogen”. J. Opt. Soc.
Am. B, v.7, No 4 , 1990, p. 631-638.
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E. Karule "Integrals of two confluent hypergeometric functions." J.Phys.A:
Math. Gen., 1990, v.23, No.11, p. 1969-1971.
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E. Karule "Above-threshold ionization of atomic hydrogen." J.Opt.Soc.Am.
B 1990, v.7, No 4, p. 631-638.
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G. Alvarez, R.Damburg, H. Silverstone; "Photoionization in Atomic Hydrogen
in Electric Field”, Phys. Rev. A 44; 1991; 13p.
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E. Karule and R.H. Pratt. "Transformed Coulomb Green function Sturmia Expansion.”
J. Phys. B, v. 24 (1991) p. 1585-1591
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E.Karule "Stability of hydrogen atom in Rydberg states in a laser field."
In:" Super-Intense Laser-Atom Physics" NATO ASI Series, Series B: Physics
vol. 316, Plenum Press, New York , 1993
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R.Damburg, B.Baranovskis, H. Silverstone; Ionization by an Electric Field:
Line Disappearance in the Stark Effect; JETP 76 (6); 1993; 8p.
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R.Damburg, B.Baranovskis; The Manifistation of Chaotic Behaviour of the
Hydrogen Atom in the Presence of Uniform Electric Field; Kluwer Academic
Publishers; Dordrecht / Boston / London; 1996; 36p.
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E. Karule. "Multiphoton ionization of atomic hydrogen using perturbation
theory.In: Advances in atomic, molecular and optical physics”, /Eds. D.
Bates and B. Bederson/ - Academic Press, New York, 1991, v.27, p.265-299.
/Review paper/
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R.Damburg, B.Baranovskis, H. Silverstone; Direct 'Ionization' of the Hydrogen
Atom by Photons in the Presence of an Electric Field; JETP 78 (6); 1994;
6p.
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A.Gailitis and E.Karule. "Hydrogen Atom Level-Mixing in Strong Laser Fields”.
In: "Resonance Ionization Spectroscopy" AIP Press, American Institute of
Physics, New York, 1994, p. 411-414.
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M.Gailitis, A.Gailitis "Photoabsorption of atomic Hydrogen in an external
electric field”, J.Phys.B.: Atomic, Molecular and Optical Physics, v.29,
No18, 1996, pp.4081-4091.
I.Bersons and A.Kulsh "Transition form factor of the hydrogen Rydberg
atom." Phys.Rev. 55, (1997) p.1674:, PDF.
Last changes in 30.03.98. by alnis@.latnet.lv