01.00.00 Communication, education, history, and philosophy

02.00.00 Mathematical methods in physics

03.00.00 Quantum mechanics, field theories, and special relativity

04.00.00 General relativity and gravitation

05.00.00 Statistical physics, thermodynamics, and nonlinear dynamical systems

06.00.00 Metrology, measurements, and laboratory procedures

07.00.00 Instruments, apparatus, and components common to several branches of physics and astronomy

11.00.00 General theory of fields and particles

12.00.00 Specific theories and interaction models; particle systematics

13.00.00 Specific reactions and phenomenology

14.00.00 Properties of specific particles

21.00.00 Nuclear structure

26.00.00 Nuclear astrophysics

28.00.00 Nuclear engineering and nuclear power studies

29.00.00 Experimental methods and instrumentation for elementary-particle and nuclear physics

31.00.00 Electronic structure of atoms and molecules: theory

32.00.00 Atomic properties and interactions with photons

33.00.00 Molecular properties and interactions with photons

34.00.00 Atomic and molecular collision processes and interactions

36.00.00 Exotic atoms and molecules; macromolecules; clusters

41.00.00 Electromagnetism; electron and ion optics

42.00.00 Optics

43.00.00 Acoustics

44.00.00 Heat transfer

47.00.00 Fluid dynamics

51.00.00 Physics of gases

52.00.00 Physics of plasmas and electric discharges

61.00.00 Structure of solids and liquids; crystallography

62.00.00 Mechanical and acoustical properties of condensed matter

63.00.00 Lattice dynamics

64.00.00 Equations of state, phase equilibria, and phase transitions

65.00.00 Thermal properties of condensed matter

66.00.00 Nonelectronic transport properties of condensed matter

67.00.00 Quantum fluids and solids

68.00.00 Surfaces and interfaces; thin films and nanosystems (structure and nonelectronic properties)

71.00.00 Electronic structure of bulk materials

72.00.00 Electronic transport in condensed matter

73.00.00 Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures

74.00.00 Superconductivity

75.00.00 Magnetic properties and materials

76.00.00 Magnetic resonances and relaxations in condensed matter, mössbauer effect

77.00.00 Dielectrics, piezoelectrics, and ferroelectrics and their properties

78.00.00 Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter

79.00.00 Electron and ion emission by liquids and solids; impact phenomena

83.00.00 Rheology

87.00.00 Biological and medical physics

89.00.00 Other areas of applied and interdisciplinary physics

91.00.00 Solid earth physics

92.00.00 Hydrospheric and atmospheric geophysics

94.00.00 Physics of the ionosphere and magnetosphere

95.00.00 Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations

96.00.00 Solar system; planetology

97.00.00 Stars

98.00.00 Stellar systems; interstellar medium; galactic and extragalactic objects and systems; the universe


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