John R. Langan

626 total citations · 1 hit paper
13 papers, 531 citations indexed

About

John R. Langan is a scholar working on Physical and Theoretical Chemistry, Organic Chemistry and Materials Chemistry. According to data from OpenAlex, John R. Langan has authored 13 papers receiving a total of 531 indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Physical and Theoretical Chemistry, 8 papers in Organic Chemistry and 3 papers in Materials Chemistry. Recurrent topics in John R. Langan's work include Photochemistry and Electron Transfer Studies (8 papers), Free Radicals and Antioxidants (4 papers) and Spectroscopy and Quantum Chemical Studies (2 papers). John R. Langan is often cited by papers focused on Photochemistry and Electron Transfer Studies (8 papers), Free Radicals and Antioxidants (4 papers) and Spectroscopy and Quantum Chemical Studies (2 papers). John R. Langan collaborates with scholars based in United Kingdom, Denmark and United States. John R. Langan's co-authors include H.G. Heller, G. Arthur Salmon, George V. Buxton, John R. Lindsay Smith, James Grimshaw, Peter P. Edwards, N. C. YANG, Ahmed S. Ellaboudy, Abdul Amir H. Kadhum and Ke Jian Liu and has published in prestigious journals such as The Journal of Physical Chemistry, Tetrahedron Letters and Journal of Chemical & Engineering Data.

In The Last Decade

John R. Langan

12 papers receiving 484 citations

Hit Papers

Photochromic heterocyclic fulgides. Part 3. The use of (E... 1981 2026 1996 2011 1981 100 200 300
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.

  1. Photochromic heterocyclic fulgides. Part 3. The use of (E)-α-(2,5-dimethyl-3-furylethylidene)(isopropylidene)succinic anhydride as a simple convenient chemical actinometer
    1981 334 citations H.G. Heller, John R. Langan Journal of the Chemical Society Perkin Transactions 2 profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
John R. Langan United Kingdom 8 259 203 145 66 55 13 531
George H. Parsons United States 9 434 1.7× 178 0.9× 278 1.9× 70 1.1× 13 0.2× 15 805
Masanobu Kojima Japan 14 349 1.3× 203 1.0× 185 1.3× 50 0.8× 30 0.5× 47 618
Allen E. Cahill United States 6 145 0.6× 126 0.6× 61 0.4× 26 0.4× 14 0.3× 8 457
D. Kreysig Germany 11 289 1.1× 241 1.2× 236 1.6× 47 0.7× 6 0.1× 94 735
Roger R. Hill United Kingdom 10 165 0.6× 103 0.5× 74 0.5× 41 0.6× 14 0.3× 29 415
E. F. Zwicker United States 9 155 0.6× 95 0.5× 183 1.3× 18 0.3× 35 0.6× 13 418
N. Uri Canada 13 292 1.1× 141 0.7× 63 0.4× 54 0.8× 11 0.2× 21 698
Farzad Deyhimi Iran 18 205 0.8× 168 0.8× 68 0.5× 28 0.4× 45 0.8× 68 903
Dennis W. Barnum United States 11 261 1.0× 254 1.3× 70 0.5× 36 0.5× 6 0.1× 15 772
Norman B. Colthup Nicaragua 14 256 1.0× 197 1.0× 112 0.8× 50 0.8× 6 0.1× 28 704

Countries citing papers authored by John R. Langan

Since Specialization
Citations

This map shows the geographic impact of John R. Langan'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 John R. Langan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John R. Langan more than expected).

Fields of papers citing papers by John R. Langan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John R. Langan. 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 John R. Langan. The network helps show where John R. Langan may publish in the future.

Co-authorship network of co-authors of John R. Langan

This figure shows the co-authorship network connecting the top 25 collaborators of John R. Langan. A scholar is included among the top collaborators of John R. Langan 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 John R. Langan. John R. Langan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

13 of 13 papers shown
1.
Grimshaw, James, John R. Langan, & G. Arthur Salmon. (1994). Dissociative electron transfer between arene radical anions and halogenoalkanes: a pulse radiolysis study. Journal of the Chemical Society Faraday Transactions. 90(1). 75–75. 24 indexed citations
2.
Langan, John R., et al.. (1989). The radiation chemistry of organic amides - II. Electron scavenging yields in N -methylpyrrolidinone. Proceedings of the Royal Society of London A Mathematical and Physical Sciences. 424(1867). 431–438. 1 indexed citations
3.
Langan, John R., et al.. (1989). The radiation chemistry of organic amides I. A pulse radiolysis study of solvated electrons and alkali-metal-electron species in cyclic amides. Proceedings of the Royal Society of London A Mathematical and Physical Sciences. 421(1860). 169–178. 7 indexed citations
4.
Liu, Ke Jian, et al.. (1988). Pulse radiolysis of solutions of sodium tetraphenylborate. The Journal of Physical Chemistry. 92(9). 2449–2451. 2 indexed citations
5.
Grimshaw, James, John R. Langan, & G. Arthur Salmon. (1988). Dissociative electron transfer between arene radical anions and 1-iodobutane studied by pulse radiolysis. Journal of the Chemical Society Chemical Communications. 1115–1115. 6 indexed citations
6.
Langan, John R. & G. Arthur Salmon. (1987). Physical properties of N-methylpyrrolidinone as functions of temperature. Journal of Chemical & Engineering Data. 32(4). 420–422. 38 indexed citations
7.
Buxton, George V., John R. Langan, & John R. Lindsay Smith. (1986). Aromatic hydroxylation. 8. A radiation chemical study of the oxidation of hydroxycyclohexadienyl radicals. The Journal of Physical Chemistry. 90(23). 6309–6313. 48 indexed citations
8.
Kadhum, Abdul Amir H., et al.. (1986). Application of pulse radiolysis to the study of the chemistry of radical anions. Journal of Radioanalytical and Nuclear Chemistry. 101(2). 319–327. 4 indexed citations
9.
YANG, N. C., et al.. (1984). Photoreduction of aromatic compounds via amine exciplexes. Tetrahedron Letters. 25(27). 2855–2858. 8 indexed citations
10.
Langan, John R. & G. Arthur Salmon. (1983). Formation and dimerization of vinylic radical anions and ion pairs. A pulse radiolysis study. Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases. 79(3). 589–589. 7 indexed citations
11.
Langan, John R. & G. Arthur Salmon. (1982). Pulse radiolysis of solutions of trans-stilbene. Radical-anions and ion-pairs in tetrahydrofuran. Journal of the Chemical Society Faraday Transactions 1 Physical Chemistry in Condensed Phases. 78(12). 3645–3645. 11 indexed citations
12.
Langan, John R., et al.. (1981). Ligand assay : analysis of international developments on isotopic and nonisotopic immunoassay. 41 indexed citations
13.
Heller, H.G. & John R. Langan. (1981). Photochromic heterocyclic fulgides. Part 3. The use of (E)-α-(2,5-dimethyl-3-furylethylidene)(isopropylidene)succinic anhydride as a simple convenient chemical actinometer. Journal of the Chemical Society Perkin Transactions 2. 341–343. 334 indexed citations breakdown →

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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