D. J. DeFrees

3.5k total citations · 2 hit papers
56 papers, 2.9k citations indexed

About

D. J. DeFrees is a scholar working on Atomic and Molecular Physics, and Optics, Spectroscopy and Atmospheric Science. According to data from OpenAlex, D. J. DeFrees has authored 56 papers receiving a total of 2.9k indexed citations (citations by other indexed papers that have themselves been cited), including 30 papers in Atomic and Molecular Physics, and Optics, 24 papers in Spectroscopy and 17 papers in Atmospheric Science. Recurrent topics in D. J. DeFrees's work include Advanced Chemical Physics Studies (26 papers), Atmospheric Ozone and Climate (16 papers) and Molecular Spectroscopy and Structure (16 papers). D. J. DeFrees is often cited by papers focused on Advanced Chemical Physics Studies (26 papers), Atmospheric Ozone and Climate (16 papers) and Molecular Spectroscopy and Structure (16 papers). D. J. DeFrees collaborates with scholars based in United States, Canada and New Zealand. D. J. DeFrees's co-authors include A. D. McLean, J. Stephen Binkley, J. A. Pople, Warren J. Hehre, William J. Pietro, Michelle Francl, Eric Herbst, Andrew McLean, D. Talbi and Sheldon Green and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Chemical Physics and The Astrophysical Journal.

In The Last Decade

D. J. DeFrees

55 papers receiving 2.8k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Self-consistent molecular orbital methods. 24. Supplemented small split-valence basis sets for second-row elements

1982 1.1k citations Warren J. Hehre, D. J. DeFrees et al. Journal of the American Chemical Society profile →
Molecular orbital predictions of the vibrational frequencies of some molecular ions

1985 376 citations D. J. DeFrees, A. D. McLean The Journal of Chemical Physics profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
D. J. DeFrees United States	27	1.6k	1.1k	808	543	505	56	2.9k
Einar Uggerud Norway	32	1.9k 1.2×	1.2k 1.1×	989 1.2×	463 0.9×	552 1.1×	176	3.6k
Jan Hrušák Germany	33	1.9k 1.2×	887 0.8×	1.2k 1.5×	409 0.8×	991 2.0×	87	3.3k
Marzio Rosi Italy	30	2.1k 1.3×	1.1k 1.0×	776 1.0×	390 0.7×	783 1.6×	201	3.6k
Robert L. Kuczkowski United States	32	2.6k 1.7×	2.4k 2.2×	1.0k 1.2×	759 1.4×	450 0.9×	170	4.3k
Y. Ellinger France	31	2.2k 1.4×	1.3k 1.2×	565 0.7×	581 1.1×	454 0.9×	150	3.4k
Paul R. Kemper United States	38	2.5k 1.6×	2.3k 2.1×	1.0k 1.2×	460 0.8×	1.5k 3.0×	102	5.0k
Jacek Koput Poland	30	1.7k 1.1×	1.2k 1.1×	832 1.0×	1.0k 1.9×	713 1.4×	183	3.4k
Rudolf Janoschek Austria	30	1.3k 0.8×	830 0.8×	1.5k 1.9×	612 1.1×	614 1.2×	155	3.2k
Jules W. Moskowitz United States	37	3.1k 2.0×	914 0.8×	402 0.5×	667 1.2×	834 1.7×	89	4.0k
Karl K. Irikura United States	30	1.8k 1.1×	936 0.9×	775 1.0×	342 0.6×	999 2.0×	98	3.5k

Countries citing papers authored by D. J. DeFrees

Since Specialization

Citations

This map shows the geographic impact of D. J. DeFrees's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by D. J. DeFrees with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites D. J. DeFrees more than expected).

Fields of papers citing papers by D. J. DeFrees

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by D. J. DeFrees. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by D. J. DeFrees. The network helps show where D. J. DeFrees may publish in the future.

Co-authorship network of co-authors of D. J. DeFrees

This figure shows the co-authorship network connecting the top 25 collaborators of D. J. DeFrees. A scholar is included among the top collaborators of D. J. DeFrees based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with D. J. DeFrees. D. J. DeFrees is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Pauzat, F., D. Talbi, Michael D. Miller, D. J. DeFrees, & Y. Ellinger. (1992). Theoretical IR spectra of ionized naphthalene. The Journal of Physical Chemistry. 96(20). 7882–7886. 85 indexed citations

Green, Sheldon, D. J. DeFrees, & A. D. McLean. (1991). Calculations of H2O microwave line broadening in collisions with He atoms: Sensitivity to potential energy surfaces. The Journal of Chemical Physics. 94(2). 1346–1359. 40 indexed citations

Herbst, Eric, D. J. DeFrees, & Wolfram Koch. (1989). Can interstellar H2S be formed via gas-phase reactions? Calculations concerning the rates of the ternary and radiative association reactions between HS+ and H2. Monthly Notices of the Royal Astronomical Society. 237(4). 1057–1065. 22 indexed citations

Palma, Amedeo, Sheldon Green, D. J. DeFrees, & A. D. McLean. (1988). Collisional excitation of interstellar water. The Astrophysical Journal Supplement Series. 68. 287–287. 26 indexed citations

Knight, John S., Simon Petrie, C. G. Freeman, et al.. (1988). Structural isomers of C2N+: a selected-ion flow tube study. Journal of the American Chemical Society. 110(16). 5286–5290. 11 indexed citations

DeFrees, D. J., et al.. (1987). Collisional excitation of interstellar cyclopropenylidene. The Astrophysical Journal Supplement Series. 65(1). 175–175. 8 indexed citations

Herbst, Eric, D. J. DeFrees, & A. D. McLean. (1987). A detailed investigation of proposed gas-phase syntheses of ammonia in dense interstellar clouds. The Astrophysical Journal. 321(2 Pt 1). 898–898. 34 indexed citations

Herbst, Eric, Nigel G. Adams, David Smith, & D. J. DeFrees. (1987). Ion-molecule calculation of the abundance ratio of CCD to CCH in dense interstellar clouds. The Astrophysical Journal. 312(1). 351–351. 33 indexed citations

DeFrees, D. J., P. R. Bunker, J. Stephen Binkley, & A. D. McLean. (1987). A high-precision Ab initio determination of the equilibrium geometry and force field of HOC+. Journal of Molecular Spectroscopy. 121(2). 440–449. 10 indexed citations

10.

DeFrees, D. J. & A. D. McLean. (1986). Ab initio determination of the proton affinities of small neutral and anionic molecules. Journal of Computational Chemistry. 7(3). 321–333. 72 indexed citations

11.

DeFrees, D. J. & A. D. McLean. (1986). A priori predictions of the rotational constants for protonated formaldehyde and protonated methanol. Chemical Physics Letters. 131(4-5). 403–408. 9 indexed citations

12.

Jarrold, Martin F., M. T. Bowers, D. J. DeFrees, A. D. McLean, & Eric Herbst. (1986). A reanalysis of the HCO(+)/HOC(+) abundance ratio in dense interstellar clouds. The Astrophysical Journal. 303(1). 392–392. 32 indexed citations

13.

DeFrees, D. J. & A. D. McLean. (1986). AB initio molecular orbital studies of low-energy, metastable isomers of the ubiquitous cyclopropenylidene. The Astrophysical Journal. 308(1). L31–L31. 73 indexed citations

14.

Gropen, Odd, Arne Haaland, D. J. DeFrees, Jorma Korvenranta, & Eberhard Hoyer. (1985). The Interaction of Main Group Metals with CC Double Bonds. Molecular Orbital Calculations on the Model Complexes H2Zn.C2H4 and H2Mg.C2H4.. Acta chemica Scandinavica/Acta chemica Scandinavica. B, Organic chemistry and biochemistry/Acta chemica Scandinavica. A, Physical and inorganic chemistry/Acta chemica Scandinavica. Series B. Organic chemistry and biochemistry/Acta chemica Scandinavica. Series A, Physical and inorganic chemistry. 39a(5). 367–369. 2 indexed citations

15.

DeFrees, D. J., A. D. McLean, & Eric Herbst. (1985). Theoretical investigation of the interstellar CH3NC/CH3CN ratio. The Astrophysical Journal. 293(1). 236–236. 39 indexed citations

16.

DeFrees, D. J. & Andrew McLean. (1985). Does carbon-protonated hydrogen cyanide, H2CN+, exist?. Journal of the American Chemical Society. 107(14). 4350–4351. 22 indexed citations

17.

DeFrees, D. J. & A. D. McLean. (1984). Basis set limit geometries for ammonia at the SCF and MP2 levels of theory. The Journal of Chemical Physics. 81(7). 3353–3355. 23 indexed citations

18.

DeFrees, D. J., Gilda H. Loew, & A. D. McLean. (1982). The rotational spectra of HOCO/plus/, HOCN, HN3, and HNCO from quantum mechanical calculations. The Astrophysical Journal. 254. 405–405. 41 indexed citations

19.

DeFrees, D. J., M. Taagepera, Beverly A. Levi, et al.. (1979). Role of hyperconjugation in secondary .beta.-deuterium isotope effects. Journal of the American Chemical Society. 101(19). 5532–5536. 19 indexed citations

20.

DeFrees, D. J., Warren J. Hehre, & Dionis E. Sunko. (1979). ChemInform Abstract: ON THE CONFORMATIONAL DEPENDENCE OF SECONDARY β‐DEUTERIUM ISOTOPE EFFECTS. Chemischer Informationsdienst. 10(32). 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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