The codes below display in the CL: Classification field.

The “general” classification codes are searchable. For example, to search for records on applied physics in general, enter

cl=10

To search for records on the applied physics of lasers, optics, and electronics, enter

cl=11

To search for all records with classification codes beginning with 1 (i.e., classification code 10 and all its subheadings), enter

cl=1*

10 APPLIED PHYSICS (GENERAL)

11 Lasers, Optics, and Electronics

12 Cryogenics and Vacuum Science

13 Magnets and Magnetism

14 Acoustics and Mechanics

15 Engineering and Industry

16 Miscellaneous Sciences

17 Instruments and Measurements

20 ATOMIC AND MOLECULAR PHYSICS (GENERAL)

21 Atomics and Molecular Structure

22 Radiation Interactions

23 Magnetic Resonance and Relaxation

24 Quantum Physics

25 Mossbauer Effect

30 CONDENSED MATTER PHYSICS (GENERAL)

31 Thins Films, Surfaces, and Interfaces

32 Microstructure

33 Physical Properties

34 Mechanical Properties

35 Thermal Properties

36 Electrical Properties

37 Magnetic Properties

38 Optical Properties

40 PLASMA PHYSICS (GENERAL)

41 Fluids

42 Gases

43 Beams

50 NUCLEAR AND HIGH-ENERGY PHYSICS (GENERAL)

51 Low-Energy Physics

52 High-Energy Physics

60 MATHEMATICS OF PHYSICS (GENERAL)

61 Mathematical Models, Numberical Analysis, and Simulation

62 Logic and Theories

63 Algebra, Geometry, and Topology

70 SUPERCONDUCTORS (GENERAL)

71 Type I Superconductors

72 Type II Superconductors

73 Atypical Superconductors

74 Models and Theories

75 Applications

80 SUPERCONDUCTORS (GENERAL)

81 Elemental Semiconductors

82 Compound Semiconductors

83 Models and Theories

84 Applications

90 SOLID STATE MILIEUX (GENERAL)

91 The Solid State and Superconductivity Industry

92 History of Solid and Superconductivity

93 Solid State and Superconductivity Education

94 Management, Marketing, and Economics