Steen Hammerum

2.1k total citations
91 papers, 1.7k citations indexed

About

Steen Hammerum is a scholar working on Spectroscopy, Organic Chemistry and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, Steen Hammerum has authored 91 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 47 papers in Spectroscopy, 41 papers in Organic Chemistry and 41 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in Steen Hammerum's work include Advanced Chemical Physics Studies (39 papers), Mass Spectrometry Techniques and Applications (36 papers) and Radical Photochemical Reactions (15 papers). Steen Hammerum is often cited by papers focused on Advanced Chemical Physics Studies (39 papers), Mass Spectrometry Techniques and Applications (36 papers) and Radical Photochemical Reactions (15 papers). Steen Hammerum collaborates with scholars based in Denmark, France and United States. Steen Hammerum's co-authors include Carl Djerassi, H. E. Audier, Peter J. Derrick, Philippe Mourgues, Steen Ingemann, Theis I. Sølling, Peder Wolkoff, Ditte Thomsen, Charles M. Nichols and Veronica M. Bierbaum and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Physical Chemistry and Chemical Physics Letters.

In The Last Decade

Steen Hammerum

90 papers receiving 1.6k citations

Peers

Steen Hammerum
Steen Ingemann Netherlands
H. E. Audier France
N. M. M. Nibbering Netherlands
Christopher F. Rodriquez Canada
Dake Yu Canada
Richard D. Bowen United Kingdom
Boris Galabov Bulgaria
Tomás L. Sordo Spain
Hiroshi Yamataka Japan
I. G. Csizmadia Canada
Steen Ingemann Netherlands
Steen Hammerum
Citations per year, relative to Steen Hammerum Steen Hammerum (= 1×) peers Steen Ingemann

Countries citing papers authored by Steen Hammerum

Since Specialization
Citations

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

Fields of papers citing papers by Steen Hammerum

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Steen Hammerum. 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 Steen Hammerum. The network helps show where Steen Hammerum may publish in the future.

Co-authorship network of co-authors of Steen Hammerum

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

All Works

20 of 20 papers shown
1.
Nielsen, Christian B., et al.. (2015). Isomerization of Metastable Amine Radical Cations by Dissociation—Recombination. European Journal of Mass Spectrometry. 21(3). 635–639. 1 indexed citations
2.
Thomsen, Ditte, Jennifer N. Reece, Charles M. Nichols, Steen Hammerum, & Veronica M. Bierbaum. (2013). Investigating the α-Effect in Gas-Phase SN2 Reactions of Microsolvated Anions. Journal of the American Chemical Society. 135(41). 15508–15514. 61 indexed citations
3.
Thomsen, Ditte, Charles M. Nichols, Jennifer N. Reece, Steen Hammerum, & Veronica M. Bierbaum. (2013). The α-Effect and Competing Mechanisms: The Gas-Phase Reactions of Microsolvated Anions with Methyl Formate. Journal of the American Society for Mass Spectrometry. 25(2). 159–168. 22 indexed citations
4.
Weddle, Gary H., et al.. (2010). Vibrational predissociation spectra of the Ar-tagged [CH4· H3O+] binary complex: spectroscopic signature of hydrogen bonding to an alkane. Molecular Physics. 108(7-9). 1191–1197. 16 indexed citations
5.
Hammerum, Steen, et al.. (2005). Competing Simple Cleavage Reactions:  The Elimination of Alkyl Radicals from Amine Radical Cations. Journal of the American Chemical Society. 127(17). 6466–6475. 11 indexed citations
6.
Petersen, Michael, et al.. (2003). Acyclic, achiral enamide nucleoside analogues. The importance of the CC bond in the analogue for its ability to mimic natural nucleosides. Organic & Biomolecular Chemistry. 1(19). 3293–3296. 9 indexed citations
7.
8.
Hammerum, Steen, et al.. (2000). The rearrangement and simple cleavage of metastable octanamine radical cations. International Journal of Mass Spectrometry. 199(1-3). 79–89. 5 indexed citations
9.
Mourgues, Philippe, H. E. Audier, & Steen Hammerum. (1994). A regiospecific cycloaddition: Successive reactions of · CH 2 CH 2 OH with CH 2 O. Rapid Communications in Mass Spectrometry. 8(1). 53–55. 12 indexed citations
10.
Mourgues, Philippe, et al.. (1993). Bimolecular reactions of distonic ions: Proton transfer and hydrogen atom abstraction with ˙CH2OH2+. Organic Mass Spectrometry. 28(10). 1098–1100. 35 indexed citations
11.
Ingemann, Steen, Steen Hammerum, Peter J. Derrick, Roel H. Fokkens, & Nico M. M. Nibbering. (1989). Energy‐dependent reversal of secondary isotope effects on simple cleavage reactions: Tertiary amine radical cations with deuterium at remote positions. Organic Mass Spectrometry. 24(10). 885–888. 9 indexed citations
12.
Audier, H. E., et al.. (1985). Intramolecular hydrogen atom abstraction with an eight-membered cyclic transition state in open-chain aliphatic aminium radicals. Tetrahedron Letters. 26(28). 3407–3408. 12 indexed citations
13.
Hammerum, Steen, et al.. (1983). Slow alkyl, alkene, and alkenyl loss from primary alkylamines. International Journal of Mass Spectrometry and Ion Physics. 47. 351–354. 24 indexed citations
14.
Hammerum, Steen, et al.. (1983). Alkane loss from the molecular ions of alcohols, ketones, and amines in the μsec timeframe. International Journal of Mass Spectrometry and Ion Physics. 47. 347–350. 20 indexed citations
15.
16.
Hammerum, Steen & Ole Hammerich. (1979). Site-specific hydrogen abstraction in the electrochemical oxidation of ketones. Tetrahedron Letters. 20(52). 5027–5030. 7 indexed citations
17.
Hammerum, Steen & Carl Djerassi. (1975). Mass spectrometry in structural and stereochemical problems—CCXLIV. Tetrahedron. 31(19). 2391–2400. 14 indexed citations
18.
Hammerum, Steen & Carl Djerassi. (1974). Mass spectrometry in structural and stereochemical problems‐CCXXIX: Electron‐impact‐induced fragmentation of boric acid esters. Organic Mass Spectrometry. 8(1). 217–227. 2 indexed citations
19.
Wolkoff, Peder, et al.. (1974). Routes to N-Aryl-N′-thioaroylhydrazines and Related sym- and unsym-Hydrazonyl Sulfides, and a Note on the So-called N-Phenyl-N′-thiobenzoyldiimide. Canadian Journal of Chemistry. 52(6). 879–883. 2 indexed citations
20.
Hammerum, Steen & Peder Wolkoff. (1972). Electron impact induced fragmentations mimicking retro-1,3-dipolar cycloadditions. The Journal of Organic Chemistry. 37(24). 3965–3966. 17 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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