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Johannes Pieter Colpa
Observed names:
J. P. COLPA,
J. P. Colpa,
J.P Colpa,
J.P. COLPA,
J.P. Colpa,
Johannes P. Colpa
show all 6
Institution:
Queen's University
Observed institutions:
Max Planck Society,
Universidade Estadual de Campinas (UNICAMP),
Queen's University,
Heidelberg University,
University of Cambridge,
Max Planck Institute for Medical Research,
Freie Universität Berlin,
Shell (Netherlands),
University of Amsterdam
show all 9
OpenAlex ID:
A5043022018
Hyperfine coupling constants and their dependence on charge densities
1963
·
J.P. Colpa
, J.R. Bolton
·
Molecular Physics
·
173
Hyperfine coupling constants of CH2 protons in paramagnetic aromatic systems
1964
·
J.P. Colpa
, E. de Boer
·
Molecular Physics
·
98
The pressure-induced rotational absorption spectrum of hydrogen: II
1958
·
J.P. Colpa
, J.A.A. Ketelaar
·
Molecular Physics
·
70
Transannular interactions in [2,2] phanes as studied by magnetic resonance and optical spectra
1975
·
D. Schweitzer
, J.P. Colpa
, et al.
·
Chemical Physics
·
62
Ions of odd alternant systems
1963
·
J.P. Colpa
, C. MacLean
, et al.
·
Tetrahedron
·
58
Optical nuclear polarization as a consequence of the non-crossing rule (level-anti-crossing)
1977
·
J.P. Colpa
, D. Stehlik
·
Chemical Physics
·
46
Signs of spin densities and vibronic interactions in 1- and 1,4-alkyl-substituted benzene anions
1967
·
E. De Boer
, J. P. Colpa
·
The Journal of Physical Chemistry
·
45
The pressure-induced rotational absorption spectrum of hydrogen: I
1958
·
J.P. Colpa
, J.A.A. Ketelaar
·
Molecular Physics
·
45
Intermolecular H-tunneling in a solid state photoreaction promoted by distinct low-energy nuclear fluctuation modes
1989
·
B. Prass
, J.P. Colpa
, et al.
·
Chemical Physics
·
43
Identification of the lowest energy nuclear fluctuation modes promoting the photochemical H-transfer tunneling reaction in doped fluorene single crystals
1988
·
B. Prass
, J. P. Colpa
, et al.
·
The Journal of Chemical Physics
·
42
Microwave-induced optical nuclear polarization (MI-ONP)
1980
·
M Deimling
, H Brunner
, et al.
·
Journal of Magnetic Resonance (1969)
·
42
An analysis of energy differences in atomic multiplets in connection with the inequality formulation of Hund's rules
1975
·
J.P. Colpa
, Ajit J. Thakkar
, et al.
·
Molecular Physics
·
38
Radical pair formation from excited states in doped aromatic crystals. II. Optical nuclear polarization (ONP) studies
1979
·
V. Macho
, J.P. Colpa
, et al.
·
Chemical Physics
·
37
Optical nuclear polarization in molecular crystals through an optical excitation cycle
1975
·
D. Stehlik
, A. Doehring
, et al.
·
Chemical Physics
·
32
Hund's rules and the interpretation and common misinterpretation of energy differences
1973
·
J.P. Colpa
, R.E. Brown
·
Molecular Physics
·
32
Hund's rule and theZexpansion for the energy, electron repulsion and electron nuclear attraction
1973
·
J.P. Colpa
, M.F.J. Islip
·
Molecular Physics
·
30
Spectrophotometric study of ion pairing in diphenylmethyl alkali metals salts
1979
·
E. Buncel
, B. C. Menon
, et al.
·
Canadian Journal of Chemistry
·
28
Evidence for tunneling as a mechanism for a photochemical hydrogen-transfer reaction in molecular crystals
1984
·
J.P. Colpa
, B. Prass
, et al.
·
Chemical Physics Letters
·
25
Hund's rules reformulated as inequalities and some related inequalities for exchange integrals, Slater-Condon parameters energy differences and correlation energies
1974
·
J.P. Colpa
·
Molecular Physics
·
25
Optical nuclear polarization as a consequence of the non-crossing rule (level-anti-crossing)
1977
·
D. Stehlik
, J.P. Colpa
·
Chemical Physics
·
24
Transannular interactions in [2.2] phanes as studied by luminescence and optical detection of magnetic resonance
1976
·
D. Schweitzer
, J.P. Colpa
, et al.
·
Journal of Luminescence
·
23
Structure of MQ-NMR spin spaces under higher n- and (n)↓ symmetries. II. Γ/ (6)↓ subduced irreps for sixfold spin clusters pertaining to the molecular cage ion, [11BH]62−
1991
·
J.P. Colpa
, F.P. Temme
·
Chemical Physics
·
20
The absorption intensity of simultaneous vibrational transitions in gas mixtures
1958
·
J.P. Colpa
, J.A.A. Ketelaar
·
Physica
·
20
Transanular interactions in [2.2]phanes—relation between spectroscopic properties and structural parameters of [2.2]phanes
1978
·
J.P. Colpa
, K.H. Hausser
, et al.
·
Chemical Physics
·
19
Comment on the Interpretation of Hyperconjugation and Spin Delocalization in Organic Radicals
1967
·
J. P. Colpa
, E. de Boer
, et al.
·
The Journal of Chemical Physics
·
19
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Works count:
74
Citation count:
1,423
H-index:
21
I10-index:
37
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