S. Ullmann

888 total citations
12 papers, 723 citations indexed

About

S. Ullmann is a scholar working on Atomic and Molecular Physics, and Optics, Materials Chemistry and Catalysis. According to data from OpenAlex, S. Ullmann has authored 12 papers receiving a total of 723 indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Atomic and Molecular Physics, and Optics, 8 papers in Materials Chemistry and 3 papers in Catalysis. Recurrent topics in S. Ullmann's work include Advanced Chemical Physics Studies (8 papers), Catalytic Processes in Materials Science (7 papers) and Electron and X-Ray Spectroscopy Techniques (3 papers). S. Ullmann is often cited by papers focused on Advanced Chemical Physics Studies (8 papers), Catalytic Processes in Materials Science (7 papers) and Electron and X-Ray Spectroscopy Techniques (3 papers). S. Ullmann collaborates with scholars based in Denmark, Netherlands and United States. S. Ullmann's co-authors include Ib Chorkendorff, I. Alstrup, Stig Helveg, H.W. Zandbergen, J.F. Creemer, Alfons M. Molenbroek, P.M. Sarro, C. Buddie Mullins, J.R. Rostrup-Nielsen and H.S. Bengaard and has published in prestigious journals such as Journal of Catalysis, Surface Science and Safety Science.

In The Last Decade

S. Ullmann

12 papers receiving 707 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
S. Ullmann Denmark	9	545	308	219	103	100	12	723
Matthew W. Small United States	13	526 1.0×	138 0.4×	92 0.4×	37 0.4×	252 2.5×	14	684
Tetsuya Uchiyama Japan	9	698 1.3×	106 0.3×	50 0.2×	70 0.7×	121 1.2×	22	955
Evgueni Kleimenov Germany	7	670 1.2×	363 1.2×	139 0.6×	12 0.1×	209 2.1×	8	824
A. David Logan United States	13	466 0.9×	260 0.8×	79 0.4×	20 0.2×	98 1.0×	20	545
Aude Bailly France	11	308 0.6×	83 0.3×	106 0.5×	26 0.3×	65 0.7×	28	445
Stefan Hannemann Switzerland	10	536 1.0×	317 1.0×	37 0.2×	26 0.3×	87 0.9×	10	642
Ryo Toyoshima Japan	17	589 1.1×	279 0.9×	175 0.8×	13 0.1×	229 2.3×	48	780
Shushi Suzuki Japan	17	659 1.2×	176 0.6×	149 0.7×	14 0.1×	301 3.0×	37	886
Andreas Klust United States	14	440 0.8×	105 0.3×	286 1.3×	11 0.1×	176 1.8×	26	704
Mikkel Jørgensen Sweden	10	543 1.0×	273 0.9×	116 0.5×	18 0.2×	259 2.6×	14	686

Countries citing papers authored by S. Ullmann

Since Specialization

Citations

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

Fields of papers citing papers by S. Ullmann

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of S. Ullmann

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

All Works

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12 of 12 papers shown

1.

Wu, Jason, Stig Helveg, S. Ullmann, Zhenmeng Peng, & Alexis T. Bell. (2016). Growth of encapsulating carbon on supported Pt nanoparticles studied by in situ TEM. Journal of Catalysis. 338. 295–304. 42 indexed citations

2.

Reinert, Dietmar, et al.. (2009). Finger and hand protection on circular table and panel saws. Safety Science. 47(8). 1175–1184. 8 indexed citations

3.

Creemer, J.F., Stig Helveg, S. Ullmann, et al.. (2009). MEMS Nanoreactor for Atomic-Resolution Microscopy of Nanomaterials in their Working State. 76–79. 7 indexed citations

4.

Creemer, J.F., Stig Helveg, S. Ullmann, et al.. (2008). Atomic-scale electron microscopy at ambient pressure. Ultramicroscopy. 108(9). 993–998. 247 indexed citations

5.

Ullmann, S., et al.. (2002). Dissociation of CH4 on Ni(111) and Ru(0001). Surface Science. 497(1-3). 183–193. 94 indexed citations

6.

Bengaard, H.S., I. Alstrup, Ib Chorkendorff, et al.. (1999). Chemisorption of Methane on Ni(100) and Ni(111) Surfaces with Preadsorbed Potassium. Journal of Catalysis. 187(1). 238–244. 89 indexed citations

7.

Alstrup, I., Ib Chorkendorff, & S. Ullmann. (1997). The Dissociative Chemisorption of Nitrogen on Iron(111) at Elevated Pressures. Zeitschrift für Physikalische Chemie. 198(1-2). 123–134. 8 indexed citations

8.

Alstrup, I., Ib Chorkendorff, & S. Ullmann. (1997). The Interaction of Nitrogen with the (111) Surface of Iron at Low and at Elevated Pressures. Journal of Catalysis. 168(2). 217–234. 24 indexed citations

9.

Alstrup, I., Ib Chorkendorff, & S. Ullmann. (1993). Interaction of hydrogen with carbidic carbon on Ni(100). Surface Science. 293(3). 133–144. 16 indexed citations

10.

Alstrup, I., Ib Chorkendorff, & S. Ullmann. (1992). The interaction of CH4 at high temperatures with clean and oxygen precovered Cu(100). Surface Science. 264(1-2). 95–102. 71 indexed citations

11.

Chorkendorff, Ib, I. Alstrup, & S. Ullmann. (1990). Xps study of chemisorption of CH4 on Ni(100). Surface Science. 227(3). 291–296. 85 indexed citations

12.

Alstrup, I., Ib Chorkendorff, & S. Ullmann. (1990). Dissociative chemisorption of CH4 on Ni(100) with preadsorbed oxygen. Surface Science. 234(1-2). 79–86. 32 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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