GRAVITATION, ASTROPHYSICS 
Collisionless gas in the field of a plane gravitational wave

1

Oscillations and instability of a multicomponent gravitating medium

7

NUCLEI, PARTICLES, AND THEIR INTERACTION 
Quasiparticle Lagrangian for the binding energies and selfconsistent fields of nuclei in the Fermiliquid approach

12

ATOMS, SPECTRA, RADIATION 
Excitation transfer between atoms

20

Effect of the magnetic moment of a charged particle on its energy loss in optically active materials

25

Absorption spectrum of a twolevel system interacting with two monochromatic fields of equal amplitudes

27

Fredericks transitions induced by light fields

32

Theory of the deceleration of atomic beams by resonant laser radiation

38

Investigation of the processes of relaxation of electron excitation in crystals for arbitrary relationships between interaction microparameters and concentrations of energy donors and acceptors

45

Strongly forbidden twophoton transitions in atoms

55

Manifestation of interference of quasimolecular states in the mass spectra of complex molecules

61

Magnetic resonance in the Faradayrotation noise spectrum

64

Asymptotic theory of the nonresonant chargetransfer process

68

PLASMA, GASES 
Amplification of reflected light in an expanding laser plasma

72

Investigation of the thermomagnetic effect in a Knudsen gas at low temperatures

75

Influence of the inhomogeniety on the turbulence spectra of a magnetoactive plasma

79

Experimental study of the acceleration of thin foils by highpower laser pulses

85

Effect of boundaries in momentum space on energy and particlenumber fluxes in a weak turbulence regime

90

SOLID STATE, LIQUIDS 
Oscillations and stability of a charged helium surface

92

Instability of surface waves in a nonuniformly heated liquid

102

Mesogenicmolecule conformation change induced by phase transitions in uniaxial liquid crystals

106

Melting of ice near a hydrophilic surface

110

Inhomogeneous phase of ^{3}He solution in superfluid ^{4}He

115

Nonlinear hydrodynamics of liquid crystals

122

Propagation of nonlinear second sound waves in He II

127

Spinwave theory of orientational phase transitions in RCo_{5} compounds

130

Quantum fluctuations of physical quantities in stationary states

136

Absorption of sound in doped piezoelectric semiconductors

140

Spatial dispersion in the theory of elasticity, and distortion around defects in quasionedimensional and quasitwodimensional crystals

148

The motion of a Josephson vortex in the field of a random potential

155

Concerning the annealing of a dislocation EPR signal in silicon

160

Vibrational spectra of the alloys Vo_{0.75}Ti_{0.25} and Vo_{0.75}Cr_{0.125}

165

Acoustic investigations of lowtemperature phase transitions in Nb and V hydrides

168

lnterband exciton Raman scattering of light in semiconductors

175

Electrooptical effects in semiconductors with degenerate bands with allowance for excitons

181

Jetlike photoelectromotive force in semiconductors

190

Phase transitions on clean (320) silicon surfaces

194

Photoresonance and mobility of electrons localized over liquid helium

198

Temperature dependence of the critical current of superconductorsemiconductorsuperconductor junctions

206

Electron mobility in twodimensional layer over the surface of solid hydrogen

214

Zerophonon ac hopping conductivity of disordered systems

218
