30. 
ATOMIC AND MOLECULAR PHYSICS 

31. 
Electronic structure of atoms and molecules: theory 

31.10.+z 
Theory of electronic structure, electronic transitions, and chemical binding (for theory and mathematical methods applied to electronic structure of biomolecules, see 87.10.e) 

31.15.p 
Calculations and mathematical techniques in atomic and molecular physics (see also 02.70.c Computational techniques, in mathematical methods in physics) 

31.15.A 
Ab initio calculations 

31.15.ac 
Highprecision calculations for fewelectron (or fewbody) atomic systems 

31.15.ae 
Electronic structure and bonding characteristics 

31.15.ag 
Excitation energies and lifetimes; oscillator strengths 

31.15.aj 
Relativistic corrections, spinorbit effects, fine structure; hyperfine structure 

31.15.am 
Relativistic configuration interaction (CI) and manybody perturbation calculations 

31.15.ap 
Polarizabilities and other atomic and molecular properties 

31.15.aq 
Strongly correlated electron systems: generalized tightbinding method 

31.15.at 
Molecule transport characteristics; molecular dynamics; electronic structure of polymers 

31.15.B 
Approximate calculations 

31.15.bt 
Statistical model calculations (including ThomasFermi and ThomasFermiDirac models) 

31.15.bu 
Semiempirical and empirical calculations (differential overlap, Hückel, PPP methods, etc.) 

31.15.bw 
Coupledcluster theory 

31.15.E 
Densityfunctional theory 

31.15.ec 
HohenbergKohn theorem and formal mathematical properties, completeness theorems 

31.15.ee 
Timedependent density functional theory 

31.15.eg 
Exchangecorrelation functionals (in current density functional theory) 

31.15.ej 
Spindensity functionals 

31.15.em 
Corrections for corespin polarization, surface effects, etc. 

31.15.ep 
Variational particlenumber approach 

31.15.es 
Applications of densityfunctional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies) 

31.15.V 
Electron correlation calculations for atoms, ions and molecules 

31.15.ve 
Electron correlation calculations for atoms and ions: ground state 

31.15.vj 
Electron correlation calculations for atoms and ions: excited states 

31.15.vn 
Electron correlation calculations for diatomic molecules 

31.15.vq 
Electron correlation calculations for polyatomic molecules 

31.15.X 
Alternative approaches 

31.15.xf 
Finitedifference schemes 

31.15.xg 
Semiclassical methods 

31.15.xh 
Grouptheoretical methods (see also 02.20.a Group theory in mathematical methods in physics) 

31.15.xj 
Hyperspherical methods 

31.15.xk 
Pathintegral methods 

31.15.xm 
Quasiparticle methods 

31.15.xp 
Perturbation theory 

31.15.xr 
Selfconsistentfield methods 

31.15.xt 
Variational techniques 

31.15.xv 
Molecular dynamics and other numerical methods (for simulation techniques for biomolecules, see 87.15.ak, ap) 

31.15.xw 
Valence bond calculations 

31.30.i 
Corrections to electronic structure (see also 03.30.+p Special relativity; for exotic atoms and molecules, see 36.10.k; for applications of densityfunctional theory, see 31.15.es) 

31.30.Gs 
Hyperfine interactions and isotope effects (see also 32.10.Fn Fine and hyperfine structure) 

31.30.J 
Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions 

31.30.jc 
Relativistic corrections to atomic structure and properties 

31.30.jd 
Relativistic corrections due to negativeenergy states or processes 

31.30.jf 
QED calculations of level energies, transition frequencies, fine structure intervals (radiative corrections, selfenergy, vacuum polarization, etc.) 

31.30.jg 
QED corrections to parity nonconserving transition amplitudes and CP violations 

31.30.jh 
QED corrections to longrange and weak interactions 

31.30.jn 
QED corrections to electric dipole moments and other atomic properties 

31.30.jp 
Electron electric dipole moment 

31.30.jr 
QED corrections (Lamb shift) in muonic hydrogen and deuterium (see also 36.10.Ee Muonium, muonic atoms and molecules) 

31.30.js 
Corrections to boundelectron g factor 

31.30.jx 
Nonrelativistic limits of DiracFock calculations 

31.30.jy 
Higherorder effective Hamiltonians 

31.30.jz 
Decay rates of hydrogenantihydrogen quasimolecules (for exotic atoms and molecules, see 36.10.k) 

31.50.x 
Potential energy surfaces (for potential energy surfaces for chemical reactions, see 82.20.Kh; for collisions, see 34.20.b) 

31.50.Bc 
Potential energy surfaces for ground electronic states 

31.50.Df 
Potential energy surfaces for excited electronic states 

31.50.Gh 
Surface crossings, nonadiabatic couplings 

31.70.f 
Effects of atomic and molecular interactions on electronic structure (see also section 34 Atomic and molecular collision processes and interactions) 

31.70.Dk 
Environmental and solvent effects 

31.70.Hq 
Timedependent phenomena: excitation and relaxation processes, and reaction rates (for chemical kinetics aspects, see 82.20.Rp) 

31.70.Ks 
Molecular solids 

31.90.+s 
Other topics in the theory of the electronic structure of atoms and molecules (restricted to new topics in section 31) 

32. 
Atomic properties and interactions with photons (for quantum chaos, see 05.45.Mt; for standards of calibration, see 06.20.fb; for relativistic and quantum electrodynamic effects, see 31.30.J) 

32.10.f 
Properties of atoms (for astrophysical applications, see 95.30.Ky) 

32.10.Bi 
Atomic masses, mass spectra, abundances, and isotopes (for mass spectroscopy, see 07.75.+h in instruments, and 82.80.Ms, Nj, Rt in physical chemistry and chemical physics) 

32.10.Dk 
Electric and magnetic moments, polarizabilities 

32.10.Ee 
Magnetic bound states, magnetic trapping of Rydberg states 

32.10.Fn 
Fine and hyperfine structure (see also 31.30.Gs Hyperfine interactions and isotope effects) 

32.10.Hq 
Ionization potentials, electron affinities 

32.30.r 
Atomic spectra (see also 78.47.J Ultrafast spectroscopy (<1 psec) in condensed matter and 82.53.Kp Coherent spectroscopy of atoms and molecules in physical chemistry and chemical physics) 

32.30.Bv 
Radiofrequency, microwave, and infrared spectra 

32.30.Dx 
Magnetic resonance spectra 

32.30.Jc 
Visible and ultraviolet spectra 

32.30.Rj 
Xray spectra 

32.50.+d 
Fluorescence, phosphorescence (including quenching) 

32.60.+i 
Zeeman and Stark effects 

32.70.n 
Intensities and shapes of atomic spectral lines (see also 31.15.p Calculations and mathematical techniques) 

32.70.Cs 
Oscillator strengths, lifetimes, transition moments 

32.70.Fw 
Absolute and relative intensities 

32.70.Jz 
Line shapes, widths, and shifts 

32.80.t 
Photoionization and excitation 

32.80.Aa 
Innershell excitation and ionization 

32.80.Ee 
Rydberg states 

32.80.Fb 
Photoionization of atoms and ions (for fluorescence yield, see 32.50.+d) 

32.80.Gc 
Photodetachment of atomic negative ions 

32.80.Hd 
Auger effect (including CosterKrönig transitions) (for Auger effect in condensed matter physics, see 79.20.Fv) 
... ... ... 
Mechanical effects of light on atoms, molecules, and ions, see 37.10.Vz 
... ... ... 
Atom cooling methods, traps and guides, see 37.10.De and 37.10.Gh 
... ... ... 
Atoms in optical lattices, see 37.10.Jk 

32.80.Qk 
Coherent control of atomic interactions with photons 

32.80.Rm 
Multiphoton ionization and excitation to highly excited states 

32.80.Wr 
Other multiphoton processes 

32.80.Xx 
Level crossing and optical pumping 

32.80.Zb 
Autoionization 

32.90.+a 
Other topics in atomic properties and interactions of atoms with photons (restricted to new topics in section 32) 

33. 
Molecular properties and interactions with photons 

33.15.e 
Properties of molecules (see also section 31, Electronic structure of atoms and molecules: theory; for molecules of interest in astrophysics, see 95.30.Ky; for structure and properties of biomolecules, see 87.15.v) 

33.15.Bh 
General molecular conformation and symmetry; stereochemistry 

33.15.Dj 
Interatomic distances and angles 

33.15.Fm 
Bond strengths, dissociation energies 

33.15.Hp 
Barrier heights (internal rotation, inversion, rotational isomerism, conformational dynamics) 

33.15.Kr 
Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility 

33.15.Mt 
Rotation, vibration, and vibrationrotation constants 

33.15.Pw 
Fine and hyperfine structure 

33.15.Ry 
Ionization potentials, electron affinities, molecular core binding energy 

33.15.Ta 
Mass spectra 

33.15.Vb 
Correlation times in molecular dynamics 

33.20.t 
Molecular spectra (see also 78.47.J Ultrafast spectroscopy (<1 psec) in condensed matter and 82.53.Kp Coherent spectroscopy of atoms and molecules; for chemical analytical methods using spectroscopy, see 82.80.Dx, Gk, Ha in physical chemistry; 87.64.t Spectroscopic and microscopic techniques in biological physics; for spectra of macromolecules and polymer molecules, see 36.20.Kd) 

33.20.Bx 
Radiofrequency and microwave spectra 

33.20.Ea 
Infrared spectra 

33.20.Fb 
Raman and Rayleigh spectra (including optical scattering) 

33.20.Kf 
Visible spectra 

33.20.Lg 
Ultraviolet spectra 

33.20.Ni 
Vacuum ultraviolet spectra 

33.20.Rm 
Xray spectra 

33.20.Sn 
Rotational analysis 

33.20.Tp 
Vibrational analysis 

33.20.Vq 
Vibrationrotation analysis 

33.20.Wr 
Vibronic, rovibronic, and rotationelectronspin interactions 

33.20.Xx 
Spectra induced by strongfield or attosecond laser irradiation 

33.25.+k 
Nuclear resonance and relaxation (see also 76.60.k Nuclear magnetic resonance and relaxation in condensed matter; 82.56.b Nuclear magnetic resonance in physical chemistry and chemical physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics) 

33.35.+r 
Electron resonance and relaxation (see also 76.30.v Electron paramagnetic resonance and relaxation in condensed matter) 

33.40.+f 
Multiple resonances (including double and higherorder resonance processes, such as double nuclear magnetic resonance, electron double resonance, and microwave optical double resonance) (see also 76.70.r Magnetic double resonances and cross effects in condensed matter) 

33.45.+x 
Mössbauer spectra (see also 76.80.+y Mössbauer effect; other γray spectroscopy in condensed matter; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej) 

33.50.j 
Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion) (for energy transfer, see also section 34; for biophysical applications, see 87.64.kv) 

33.50.Dq 
Fluorescence and phosphorescence spectra 

33.50.Hv 
Radiationless transitions, quenching 

33.55.+b 
Optical activity and dichroism 

33.57.+c 
Magnetooptical and electrooptical spectra and effects (for electro and magnetooptical effects in condensed matter spectroscopy, see 78.20.Jq, and 78.20.Ls, respectively) 

33.60.+q 
Photoelectron spectra (for biophysical applications, see 87.64.ks) 

33.70.w 
Intensities and shapes of molecular spectral lines and bands 

33.70.Ca 
Oscillator and band strengths, lifetimes, transition moments, and FranckCondon factors 

33.70.Fd 
Absolute and relative line and band intensities 

33.70.Jg 
Line and band widths, shapes, and shifts 

33.80.b 
Photon interactions with molecules (see also 42.50.p Quantum optics) 

33.80.Be 
Level crossing and optical pumping 

33.80.Eh 
Autoionization, photoionization, and photodetachment 

33.80.Gj 
Diffuse spectra; predissociation, photodissociation 
... ... ... 
Slowing, cooling, and trapping of molecules, see 37.10.Mn and 37.10.Pq 

33.80.Rv 
Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) 

33.80.Wz 
Other multiphoton processes 

33.90.+h 
Other topics in molecular properties and interactions with photons (restricted to new topics in section 33) 

34. 
Atomic and molecular collision processes and interactions (for atomic, molecular, and ionic collisions in plasma, see 52.20.Hv; for atoms and molecules of astrophysical interest, see 95.30.Dr, Ft; see also 98.38.Bn and 98.58.Bz in interstellar media in astronomy; 87.15.K Molecular interactions, membraneprotein interactions in biological physics) 

34.10.+x 
General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.) 

34.20.b 
Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions (see also 82.20.Kh Potential energy surfaces for reactions; for potential energy surfaces in electronic structure calculations, see 31.50.x) 

34.20.Cf 
Interatomic potentials and forces 

34.20.Gj 
Intermolecular and atommolecule potentials and forces 

34.35.+a 
Interactions of atoms and molecules with surfaces (see also 79.77.+g Coulomb explosion) 

34.50.s 
Scattering of atoms and molecules 

34.50.Bw 
Energy loss and stopping power 

34.50.Cx 
Elastic; ultracold collisions 

34.50.Ez 
Rotational and vibrational energy transfer 

34.50.Fa 
Electronic excitation and ionization of atoms (including beamfoil excitation and ionization) 

34.50.Gb 
Electronic excitation and ionization of molecules 

34.50.Lf 
Chemical reactions 

34.50.Rk 
Lasermodified scattering and reactions 

34.70.+e 
Charge transfer (for charge transfer in biological systems, see 82.39.Jn in physical chemistry) 

34.80.i 
Electron and positron scattering 

34.80.Bm 
Elastic scattering 

34.80.Dp 
Atomic excitation and ionization 

34.80.Gs 
Molecular excitation and ionization 

34.80.Ht 
Dissociation and dissociative attachment 

34.80.Lx 
Recombination, attachment, and positronium formation 

34.80.Nz 
Spin dependence of cross sections; polarized beam experiments 

34.80.Pa 
Coherence and correlation 

34.80.Qb 
Lasermodified scattering 

34.80.Uv 
Positron scattering 

34.90.+q 
Other topics in atomic and molecular collision processes and interactions (restricted to new topics in section 34) 

36. 
Exotic atoms and molecules; macromolecules; clusters 

36.10.k 
Exotic atoms and molecules (containing mesons, antiprotons and other unusual particles) 

36.10.Dr 
Positronium (see also 82.30.Gg Positronium chemistry) 

36.10.Ee 
Muonium, muonic atoms and molecules [see also 31.30.jr QED corrections (Lamb shift) in muonic hydrogen and deuterium] 

36.10.Gv 
Mesonic, hyperonic and antiprotonic atoms and molecules 

36.20.r 
Macromolecules and polymer molecules 

36.20.Cw 
Molecular weights, dispersity 

36.20.Ey 
Conformation (statistics and dynamics) 

36.20.Fz 
Constitution (chains and sequences) 

36.20.Hb 
Configuration (bonds, dimensions) 

36.20.Kd 
Electronic structure and spectra 

36.20.Ng 
Vibrational and rotational structure, infrared and Raman spectra 

36.40.c 
Atomic and molecular clusters (see also 61.46.w Nanoscale materials in condensed matter) 

36.40.Cg 
Electronic and magnetic properties of clusters 

36.40.Ei 
Phase transitions in clusters 

36.40.Gk 
Plasma and collective effects in clusters 

36.40.Jn 
Reactivity of clusters 

36.40.Mr 
Spectroscopy and geometrical structure of clusters 

36.40.Qv 
Stability and fragmentation of clusters 

36.40.Sx 
Diffusion and dynamics of clusters 

36.40.Vz 
Optical properties of clusters 

36.40.Wa 
Charged clusters 

36.90.+f 
Other topics in exotic atoms and molecules; macromolecules; clusters (restricted to new topics in section 36) 

37. 
Mechanical control of atoms, molecules, and ions (see also 82.37.Gk STM and AFM manipulations of a single molecule in physical chemistry and chemical physics; for atom manipulation in nanofabrication and processing, see 81.16.Ta; see also 03.75.b Matter waves) 

37.10.x 
Atom, molecule, and ion cooling methods (see also 87.80.Cc Optical trapping in biophysical techniques) 

37.10.De 
Atom cooling methods 

37.10.Gh 
Atom traps and guides 

37.10.Jk 
Atoms in optical lattices 

37.10.Mn 
Slowing and cooling of molecules 

37.10.Pq 
Trapping of molecules 

37.10.Rs 
Ion cooling 

37.10.Ty 
Ion trapping 

37.10.Vz 
Mechanical effects of light on atoms, molecules, and ions 

37.20.+j 
Atomic and molecular beam sources and techniques 

37.25.+k 
Atom interferometry techniques (see also 03.75.Dg Atom and neutron interferometry in matter waves) 

37.30.+i 
Atoms, molecules, and ions in cavities (see also 42.50.Pq Cavity quantum electrodynamics; micromasers) 

37.90.+j 
Other topics in mechanical control of atoms, molecules, and ions (restricted to new topics in section 37) 
