1999 PACS - Hierarchical List

Full List of all PACS numbers: Number order 
Full List of all PACS numbers: Alphabetical order

00. SUMMARY OF PACS SCHEME 01. Communication, education, history, and philosophy 02. Mathematical methods in physics 03. Quantum mechanics, field theories, and special 04. General relativity and gravitation 05. Statistical physics and thermodynamics 06. Metrology, measurements, and laboratory procedures 07. Instruments, apparatus, components, and techniques common to 10. THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS 11. General theory of fields and particles 12. Specific theories and interaction models; particle systematics 13. Specific reactions and phenomenology 14. Properties of specific particles 20. NUCLEAR PHYSICS 21. Nuclear structure 23. Radioactive decay and in-beam spectroscopy 24. Nuclear reactions: general 25. Nuclear reactions: specific reactions 26. Nuclear Astrophysics 27. Properties of specific nuclei listed by mass ranges 28. Nuclear engineering and nuclear power studies 29. Experimental methods and instrumentation for elementary-particle and nuclear physics 30. ATOMIC AND MOLECULAR PHYSICS 31. Electronic structure of atoms, molecules and their ions: theory 32. Atomic properties and interactions with photons 33. Molecular properties and interactions with photons 34. Atomic and molecular collision processes and interactions 36. Studies of special atoms, molecules and their ions; clusters 39. Instrumentation and Techniques for Atomic and Molecular Physics 40. ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL 41. Electromagnetism; electron and ion optics 42. Optics 43. Acoustics 44. Heat transfer, thermal and thermodynamic processes 45. Classical mechanics of discrete systems 46. Continuum mechanics of solids 47. Fluid dynamics 50. PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES 51. Physics of gases 52. The physics of plasmas and electric discharges 60. CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES 61. Structure of solids and liquids; crystallography 62. Mechanical and acoustical properties of condensed matter 63. Lattice dynamics 64. Equations of state, phase equilibria, and phase transitions 65. Thermal properties of condensed matter 66. Transport properties of condensed matter (nonelectronic) 67. Quantum fluids and solids; liquid and solid helium 68. Surfaces and interfaces; thin films and whiskers (structure
and nonelectronic properties) 70. CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES 71. Electronic structure 72. Electronic transport in condensed matter 73. Electronic structure and electrical properties of surfaces, interfaces, and thin films 74. Superconductivity 75. Magnetic properties and materials 76. Magnetic resonances and relaxations in condensed matter, Mossbauer effect 77. Dielectrics, piezoelectrics, and ferroelectrics and their properties 78. Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation 79. Electron and ion emission by liquids and solids; impact phenomena 80. INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY 81. Materials science 82. Physical chemistry 83. Rheology 84. Electronics; radiowave and microwave technology; direct energy
conversion and storage 85. Electronic and magnetic devices; microelectronics 87. Biological and medical physics 89. Topics of general interest to physicists 90. GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS 91. Solid Earth physics 92. Hydrospheric and atmospheric geophysics 93. Geophysical observations, instrumentation, and techniques 94. Aeronomy and magnetospheric physics 95. Fundamental astronomy and astrophysics; instrumentation, techniques and astronomical observations 96. Solar System 97. Stars 98. Stellar systems; interstellar medium; galactic and
extragalactic objects and systems; the Universe