J. Colpa

发表

Hyperfine coupling constants and their dependence on charge densities

J. Bolton, J. Colpa, 1963 .

On the heat capacity of the (nearly) quadratic heisenberg, , ferromagnet

J. Colpa, 1972 .

Transanular interactions in [2.2]phanes-relation between spectroscopic properties and structural parameters of [2.2]phanes

J. Colpa, K. Hausser, D. Schweitzer, 1978 .

The inequality formulation of Hund’s rule and a reinterpretation of singlet–triplet energy differences, generalized for molecules at equilibrium geometry

J. Colpa, R. Brown, 1978 .

Transannular interactions in [2,2] phanes as studied by magnetic resonance and optical spectra

J. Colpa, K. Hausser, M. Haenel, 1975 .

CALCULATION OF THE π ELECTRON ENERGY OF AROMATIC IONS WITH AN ODD NUMBER OF ELECTRONS: SOME REMARKS ON THE JAHN—TELLER EFFECT

J. Colpa, 1962 .

Vibrationally induced nuclear spin relaxation of quadrupolar nuclei

R. J. Brown, J. Colpa, 1982 .

Study of the specific heat of a CeCoAl4 single crystal in high magnetic fields

P. Brommer, F. D. Boer, L. D. Tung, 1998 .

The static and Dynamic NMR spectra of 4,4′‐bis(N‐isopropyl‐N‐nitrosoamino)biphenyl, a four‐site exchange problem

J. Colpa, E. Buncel, T. Grindley, 1986 .

Microwave-Induced Optical Nuclear Polarization (MI-ONP)

M. Deimling, K. Dinse, J. Colpa, 1980 .

Optical nuclear polarization as a consequence of the non-crossing rule (level-anti-crossing): I. Analytical treatment of ONP in the level-crossing region

J. Colpa, D. Stehlik, J. P. Colpa, 1977 .

Optical nuclear polarization in molecular crystals through an optical excitation cycle

J. Colpa, D. Stehlik, E. Callaghan, 1975 .

Interpretation of level-anticrossing phenomena in phosphorescence and optical nuclear polarization in organic crystals

M. Deimling, K. Dinse, J. Colpa, 1982 .

Physical role of v-invariants in SU(2) (m) × L8 dual mappings over {H̃v} carrier spaces for Liouville multiple-quantum NMR of spin clusters within Ln-automorphisms: [13CH]8, [−2D]8-cubanes and some SU(6) aspects of a [Ti]8[13C]+12-met-carb

J. Colpa, F. Temme, 1994 .

Symmetry substructures for MQ-NMR of [A]20 spin clusters of dodecahedranes, [13CH]20 or [13CD]20, metallic M @M20 and [H2O]+ @[H2O]20 exo-cage cluster molecules and their higher-n SO(3) ×lnspin algebras, within the context of mapping,ln-ITP algebras and number partitions

J. Colpa, F. Temme, 1993 .

Demonstration of the origins of cooperativity within SU2×L6 mapping over $$\left\{ {I\tilde H_\upsilon } \right\}$$ Liouvillian carrier subspaces characterising the MQ-NMR cluster [A]6(L6) and its $$\{ |kq\upsilon :[\tilde \lambda ] > > \} $$ tensorial bases

J. Colpa, F. Temme, 1992 .

Aspects of J pathways in [A] n ()/[AX] spin systems over partitional, or coherent superpositional, Liouville space bases involving intracluster coupling, or associated with coherence transfer in [A…X] (Ii = 1/2) systems: further group theoretical considerations

J. Colpa, F. Temme, 1991 .

Aspects Of SU2 × ϕn Liouvillian Duality and SU2/SO(3) × (ϕ12 ↓ A5) Symmetry Over Spin (Spin-Isomorphic) Spaces Of MO-NMR and Ouantum-Rotational Tunnelling Problems

J. Colpa, F. Temme, 1990 .

Far-infrared spectroscopy of solid α-oxygen in magnetic fields up to 15 tesla

R. Meier, H. Sigg, J. Colpa, 1984 .

Microwave-induced optical nuclear polarization (MI ONP) of benzophenone in dibromodiphenylether

P. Bachert, J. Colpa, K. Hausser, 1984 .

Scheibe's rule and the SCF theory

J. Colpa, U. H. Kollaard, 1964 .

Ions of odd alternant systemsProton complexes of aromatic hydrocarbons

J. Colpa, C. Maclean, E. L. Mackor, 1963 .

Specific heat of a CeCoAl4 single crystal in high magnetic field

P. Brommer, F. D. Boer, L. D. Tung, 1999 .

Magnetic properties of monocrystalline GdCo4B

P. Brommer, J. Colpa, N. P. Thuy, 1996 .

A mathematical model for time-resolved radiofrequency-induced optical nuclear polarization

J. Colpa, J. Rowat, 1989 .

Radio frequency (RF-) saturation spectroscopy as detected via optical nuclear polarization, mechanisms due to ESR and NMR transitions in excited triplet states

J. Colpa, H. Vieth, D. Stehlik, 1980 .

The pressure-induced rotational absorption spectrum of hydrogen: I

J. Colpa, J. Ketelaar, 1958 .

Pure Rotational Absorption Spectrum of Hydrogen

F. Hooge, J. Colpa, J. Ketelaar, 1955 .

Transition temperatures of weakly anisotropic layer-type magnets. Dependence on anisotropy

P. Bloembergen, J. Colpa, L. J. Jongh, 1972 .

Hund's rule and the Z expansion for the energy, electron repulsion and electron nuclear attraction

J. Colpa, M. Islip, 1973 .

Analysis of correlation effects in HeI, LiI and BeI iso-electronic sequences by Z-expansion methods

J. Colpa, M. Islip, 1972 .

Optically active free radicals: circular dichroism, optical absorption and emission and ESR studies on optically active 1S(+)- and 1R(−)-camphorquinone radicals

J. Colpa, J. Wan, S. Sur, 1986 .

Investigation of the excited triplet states of [2.2]- and [3.3]paracyclophane

J. Colpa, K. Hausser, M. Haenel, 1979 .

Identification of the lowest energy nuclear fluctuation modes promoting the photochemical H‐transfer tunneling reaction in doped fluorene single crystals

J. Colpa, B. Prass, D. Stehlik, 1988 .

Symmetry considerations for solid-state photochemical hydrogen-abstraction reactions. Applications to fluorene doped with acridine and related systems

J. Colpa, D. Stehlik, 1983 .

The kinetics of the photochemical hydrogen abstraction in crystals of fluorene doped with acridine

J. Colpa, D. Stehlik, 1982 .

ESR and cidep studies of the photochemical processes in benzoyl formic acid single crystal

J. Colpa, J. Wan, S. Emori, 1983 .

The interaction of unpaired electron in free radicals with optically active enantiomers: Induced circular dichroism of DPPH in optically active 2-octanol

L. Walker, J. Colpa, J. Wan, 1985 .

Hyperfine coupling constants of CH2 protons in paramagnetic aromatic systems

J. Colpa, E. D. Boer, 1964 .

Comparison of the zero-point spin reduction in the antiferromagnets RbMnF3 and Rb2MnF4

J. Colpa, R. Linde, E. Sieverts, 1971 .

Comment on the Interpretation of Hyperconjugation and Spin Delocalization in Organic Radicals

M. Karplus, J. Colpa, E. D. Boer, 1967 .

Diagonalization of the quadratic boson hamiltonian

J. Colpa, 1978 .

Spin symmetry and gel'fand patterns of higher SU2×ℓn groups

J. Colpa, F. Temme, 1992 .

Temperature dependence of the reorientation of the ND3+ group in α-glycine

U. Haeberlen, J. Colpa, J. Rowat, 1985 .

Dipole fields and electric-field gradients in their dependence on the macroscopic and microscopic crystal parameters for orthorhombic and hexagonal lattices. II

J. Colpa, J.H.P. Colpa, 1971 .

Heat capacity of KMnF3 and K2MnF4 below 1°K

J. Colpa, K. Chang, F.P.D. Obbema, 1968 .

Summary ofSn mapping properties of some lexicalp-tuples, or wordlengths, over (M1-M2) fields of Rota-Cayley algebra in generating Hilbert space SO(3) xSn irreps of higherIi identical spin clusters, [A]n(Sn), forn ≤ 7

J. Colpa, F. Temme, 1992 .

Magnetocrystalline anisotropy and RCo exchange interaction in monocrystalline RCo4Al (R = Y, Gd and Ho)

P. Brommer, E. Brück, J. Colpa, 1996 .

High-field magnetization and specific heat of TmNi5

J. Colpa, R. Radwanski, F. Kayzel, 1996 .

An infrared spectroscopic study of the structure and solvation of diphenylmethyllithium in ethereal solvents

H. F. Shurvell, J. Colpa, E. Buncel, 1982 .

Schur functions over polyhedral lattice-point models: Contrasts in determinacy criteria for ((?1?2)?n) vs. ((?1?2,?,?m?(n/2))?n) partite SU(m)?n?? group embeddings: SU(m)?8??4 spin symmetry of [H11B]

J. Colpa, F. Temme, 2000 .

Evidence for tunneling as a mechanism for a photochemical hydrogen-transfer reaction in molecular crystals

J. Colpa, B. Prass, D. Stehlik, 1984 .

Vibrational force constants of benzene: MO analysis

J. Colpa, S. D. Bruijn, 1970 .

Magnetocrystalline anisotropy and exchange interaction of single crystalline RCo4M (R: Y, Gd, Ho; M: Al, B)

P. Brommer, E. Brück, J. Colpa, 1996 .

Magnetocrystalline anisotropy and magnetic structure of Nd2Co17

J. Colpa, R. Radwanski, J. Franse, 1988 .

Molecular field at the rare-earth sites in Nd2Co17

P. Frings, J. Colpa, R. Radwanski, 1994 .

Magnetic excitations in Dy2Co17

P. Frings, J. Colpa, R. Radwanski, 1989 .

An analysis of energy differences in atomic multiplets in connection with the inequality formulation of Hund's rules

V. H. Smith, A. Thakkar, J. Colpa, 1975 .

Hund's rules reformulated as inequalities and some related inequalities for exchange integrals, Slater-Condon parameters energy differences and correlation energies

J. Colpa, 1974 .

Hund's rules and the interpretation and common misinterpretation of energy differences

J. Colpa, R. E. Brown, 1973 .

SCF and CI Studies of Hund's rules for the effects of electronic correlation and delocalization. I

J. Colpa, R. E. Brown, 1983 .

Signs of spin densities and vibronic interactions in 1- and 1,4-alkyl-substituted benzene anions

J. Colpa, E. D. Boer, 1967 .

Optically active free radicals: circular dichroism of vitamin E acetate radical cation

J. Colpa, S. Sur, 1986 .

Intermolecular H-tunneling in a solid state photoreaction promoted by distinct low-energy nuclear fluctuation modes

J. Colpa, B. Prass, D. Stehlik, 1989 .

Contribution to the theory of microwave-induced optical nuclear polarization (MI ONP). Formal equivalence of microwave-induced and level-anticrossing optical nuclear polarization. Extremum values for polarization

J. Colpa, 1984 .

Radical pair formation from excited states in doped aromatic crystals. II. Optical nuclear polarization (ONP) studies

J. Colpa, D. Stehlik, V. Macho, 1979 .

Oxidative phenomena in dilute solutions of substances with a system of conjugated double bonds. III. Further studies on vitamin‐A acetate

E. H. Groot, J. Colpa, 1949 .

Magnetic field dependence of phosphorescence intensity and optical nuclear polarization (ONP) as a result of level-anti-crossing (LAC) and relaxation i

J. Colpa, D. Stehlik, F. Seiff, 1978 .

Competing exchange interactions and their relevance for the magnetisation process in RMn6-xCrxSn6 powders (R=Y, Gd, Tb, Dy, Ho, Er)

F. D. Boer, J. Brabers, K. Buschow, 1994 .

Diagonalisation of the quadratic fermion Hamiltonian with a linear part

J. Colpa, 1979 .

Diagonalization of the quadratic boson Hamiltonian with zero modes: I. Mathematical

J. Colpa, 1986 .

Thermal and photochemical reactions of organotin with aminophenols. ESR and other spectroscopic study of a novel organotin radical complex of 2-amino-4-tert-butylphenol

J. Colpa, S. Sur, 1989 .

Chemically Induced Dynamic Electron Polarization. I. A Simple Theory for H Atom

J. Colpa, J. Wan, D. Hutchinson, 1972 .

ESR Characterizations and Photochemistry of the Free Radical Species from 1,1′-Bi-2-Naphthol and Related Compounds

J. Colpa, S. Sur, 1989 .