Douglas J. DeFrees

9.2k total citations · 1 hit paper
21 papers, 8.3k citations indexed

About

Douglas J. DeFrees is a scholar working on Atomic and Molecular Physics, and Optics, Physical and Theoretical Chemistry and Organic Chemistry. According to data from OpenAlex, Douglas J. DeFrees has authored 21 papers receiving a total of 8.3k indexed citations (citations by other indexed papers that have themselves been cited), including 13 papers in Atomic and Molecular Physics, and Optics, 9 papers in Physical and Theoretical Chemistry and 7 papers in Organic Chemistry. Recurrent topics in Douglas J. DeFrees's work include Advanced Chemical Physics Studies (9 papers), Spectroscopy and Quantum Chemical Studies (7 papers) and Molecular Spectroscopy and Structure (4 papers). Douglas J. DeFrees is often cited by papers focused on Advanced Chemical Physics Studies (9 papers), Spectroscopy and Quantum Chemical Studies (7 papers) and Molecular Spectroscopy and Structure (4 papers). Douglas J. DeFrees collaborates with scholars based in United States, Croatia and Germany. Douglas J. DeFrees's co-authors include Warren J. Hehre, John A. Pople, J. Stephen Binkley, William J. Pietro, Michelle Francl, Mark S. Gordon, Robert T. McIver, Beverly A. Levi, Steven K. Pollack and Wolfram Koch and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Chemical Physics and The Journal of Physical Chemistry.

In The Last Decade

Douglas J. DeFrees

20 papers receiving 8.1k 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. XXIII. A polarization-type basis set for second-row elements

1982 7.3k citations Michelle Francl, William J. Pietro et al. The Journal of Chemical Physics profile →

Peers

Douglas J. DeFrees

AMPO

PTC

G. S. Chandler Australia

Günther W. Spitznagel Germany

Christoph Kölmel Germany

Michael Bär Germany

S. J. Cyvín Norway

James D. Patterson United States

Harold Basch Israel

F. L. Hirshfeld Israel

Karin Eichkorn Germany

S. P. McGlynn United States

G. S. Chandler Australia

Douglas J. DeFrees

3.5k ×1.1

2.6k ×1.1

3.5k ×1.5

AMPO

2.2k ×1.3

1.7k ×1.2

PTC

Citations per year, relative to Douglas J. DeFrees Douglas J. DeFrees (= 1×) peers G. S. Chandler

Countries citing papers authored by Douglas J. DeFrees

Since Specialization

Citations

This map shows the geographic impact of Douglas 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 Douglas 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 Douglas J. DeFrees more than expected).

Fields of papers citing papers by Douglas J. DeFrees

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Douglas 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 Douglas J. DeFrees. The network helps show where Douglas J. DeFrees may publish in the future.

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

This figure shows the co-authorship network connecting the top 25 collaborators of Douglas J. DeFrees. A scholar is included among the top collaborators of Douglas 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 Douglas J. DeFrees. Douglas 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

Koch, Wolfram, et al.. (1990). Experimentelles und theoretisches IR‐Spektrum des 2‐Norbornyl‐Kations. Angewandte Chemie. 102(2). 198–200. 15 indexed citations

Koch, Wolfram, et al.. (1990). Experimental and Theoretical IR Spectra of the 2‐Norbornyl Cation. Angewandte Chemie International Edition in English. 29(2). 183–185. 22 indexed citations

Koch, Wolfram, Bowen Liu, & Douglas J. DeFrees. (1989). Structure of the 2-norbornyl cation. Journal of the American Chemical Society. 111(4). 1527–1528. 28 indexed citations

Koch, Wolfram, Bowen Liu, & Douglas J. DeFrees. (1988). The C4H7+ cation. A theoretical investigation. Journal of the American Chemical Society. 110(22). 7325–7328. 50 indexed citations

Tarter, Jill, Douglas J. DeFrees, D. E. Brownlee, et al.. (1986). Exobiology in earth orbit. Origins of Life and Evolution of Biospheres. 16(3-4). 419–419. 1 indexed citations

DeFrees, Douglas J., et al.. (1983). Additions and Corrections - Effect of Electron Correlation on Theoretical Equilibrium Geometries. 2. Comparison of Third-Order Perturbation and Configuration Interaction Results with Experiment. Journal of the American Chemical Society. 105(11). 3745–3745. 5 indexed citations

Francl, Michelle, William J. Pietro, Warren J. Hehre, et al.. (1982). Self-consistent molecular orbital methods. XXIII. A polarization-type basis set for second-row elements. The Journal of Chemical Physics. 77(7). 3654–3665. 7336 indexed citations breakdown →

DeFrees, Douglas J., Krishnan Raghavachari, H. Bernhard Schlegel, & John A. Pople. (1982). Effect of electron correlation of theoretical equilibrium geometries. 2. Comparison of third-order perturbation and configuration interaction results with experiment. Journal of the American Chemical Society. 104(21). 5576–5580. 108 indexed citations

Whiteside, Robert A., R. Krishnan, Douglas J. DeFrees, John A. Pople, & Paul von Ragué Schleyer. (1981). Structures of C4. Chemical Physics Letters. 78(3). 538–540. 101 indexed citations

10.

Pross, Addy, Douglas J. DeFrees, Beverly A. Levi, et al.. (1981). Theoretical approach to substituent effects. Structures and stabilities of carbanions XCH2. The Journal of Organic Chemistry. 46(8). 1693–1699. 64 indexed citations

11.

Pietro, William J., Edward S. Blurock, Robert F. Hout, et al.. (1981). Molecular orbital theory of the properties of inorganic and organometallic compounds. 2. STO-NG basis sets for fourth-row main-group elements. Inorganic Chemistry. 20(11). 3650–3654. 52 indexed citations

12.

DeFrees, Douglas J., Robert T. McIver, & Warren J. Hehre. (1980). Heats of formation of gaseous free radicals via ion cyclotron double resonance spectroscopy. Journal of the American Chemical Society. 102(10). 3334–3338. 128 indexed citations

13.

DeFrees, Douglas J., Beverly A. Levi, Steven K. Pollack, et al.. (1979). Effect of electron correlation on theoretical equilibrium geometries. Journal of the American Chemical Society. 101(15). 4085–4089. 187 indexed citations

14.

DeFrees, Douglas J., Warren J. Hehre, Robert T. McIver, & Darl H. McDaniel. (1979). Heat of formation and adiabatic electron affinity of amidogen. The Journal of Physical Chemistry. 83(2). 232–237. 16 indexed citations

15.

DeFrees, Douglas J., Warren J. Hehre, & Dionis E. Sunko. (1979). On the conformational dependence of secondary .beta.-deuterium isotope effects. Journal of the American Chemical Society. 101(9). 2323–2327. 17 indexed citations

16.

DeFrees, Douglas J. & Warren J. Hehre. (1978). Methyleneimine. The Journal of Physical Chemistry. 82(4). 391–393. 35 indexed citations

17.

DeFrees, Douglas J. & Robert T. McIver. (1977). Elimination of oscillator coupling effects in ion cyclotron double resonance experiments. Review of Scientific Instruments. 48(5). 574–576. 2 indexed citations

18.

DeFrees, Douglas J., Robert T. McIver, & Warren J. Hehre. (1977). The proton affinities of phenol. Journal of the American Chemical Society. 99(11). 3853–3854. 38 indexed citations

19.

DeFrees, Douglas J., et al.. (1977). In support of anionic hyperconjugation. The versatile methyl group. Journal of the American Chemical Society. 99(19). 6451–6452. 35 indexed citations

20.

Wolf, J. F., et al.. (1976). Isotope effects on gas phase reaction processes. 2. Equilibrium isotope effects on the proton transfer reactions of methylbenzenes. Journal of the American Chemical Society. 98(17). 5097–5101. 4 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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