H. D. Freyer

1.7k total citations
27 papers, 1.3k citations indexed

About

H. D. Freyer is a scholar working on Atmospheric Science, Global and Planetary Change and Industrial and Manufacturing Engineering. According to data from OpenAlex, H. D. Freyer has authored 27 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Atmospheric Science, 12 papers in Global and Planetary Change and 7 papers in Industrial and Manufacturing Engineering. Recurrent topics in H. D. Freyer's work include Geology and Paleoclimatology Research (8 papers), Chemical Synthesis and Characterization (6 papers) and Plant Water Relations and Carbon Dynamics (5 papers). H. D. Freyer is often cited by papers focused on Geology and Paleoclimatology Research (8 papers), Chemical Synthesis and Characterization (6 papers) and Plant Water Relations and Carbon Dynamics (5 papers). H. D. Freyer collaborates with scholars based in Germany, United States and France. H. D. Freyer's co-authors include K. Kobel, D. Kley, A. Volz‐Thomas, Susan Trumbore, Wallace S. Broecker, Tsung‐Hung Peng, K. Wagener, Michel Legrand, R. Delmas and Β. A. Bilal and has published in prestigious journals such as Nature, Journal of Geophysical Research Atmospheres and Chemical Geology.

In The Last Decade

H. D. Freyer

27 papers receiving 1.2k citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
H. D. Freyer Germany	16	921	643	388	297	150	27	1.3k
Jean‐François Hélie Canada	22	492 0.5×	381 0.6×	463 1.2×	328 1.1×	226 1.5×	54	1.3k
Carmen A. Nezat United States	14	413 0.4×	120 0.2×	284 0.7×	242 0.8×	89 0.6×	20	1.1k
Shuhui Zheng United States	7	476 0.5×	311 0.5×	442 1.1×	59 0.2×	72 0.5×	8	1.2k
Moire A. Wadleigh Canada	16	477 0.5×	147 0.2×	155 0.4×	250 0.8×	66 0.4×	19	753
Hein de Baar Netherlands	9	464 0.5×	263 0.4×	252 0.6×	94 0.3×	446 3.0×	12	998
F. Dehairs Belgium	11	312 0.3×	199 0.3×	513 1.3×	113 0.4×	357 2.4×	15	926
Dennis S. Anderson United States	16	351 0.4×	116 0.2×	400 1.0×	74 0.2×	125 0.8×	26	816
K. Wagener Germany	9	347 0.4×	414 0.6×	145 0.4×	97 0.3×	34 0.2×	30	727
B. Bolin Sweden	11	309 0.3×	458 0.7×	174 0.4×	42 0.1×	160 1.1×	21	885
Kenneth A. McGee United States	12	370 0.4×	291 0.5×	161 0.4×	55 0.2×	180 1.2×	20	959

Countries citing papers authored by H. D. Freyer

Since Specialization

Citations

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

Fields of papers citing papers by H. D. Freyer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H. D. Freyer. 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 H. D. Freyer. The network helps show where H. D. Freyer may publish in the future.

Co-authorship network of co-authors of H. D. Freyer

This figure shows the co-authorship network connecting the top 25 collaborators of H. D. Freyer. A scholar is included among the top collaborators of H. D. Freyer 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 H. D. Freyer. H. D. Freyer 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

Freyer, H. D., D. Kley, A. Volz‐Thomas, & K. Kobel. (1993). On the interaction of isotopic exchange processes with photochemical reactions in atmospheric oxides of nitrogen. Journal of Geophysical Research Atmospheres. 98(D8). 14791–14796. 132 indexed citations

Freyer, H. D.. (1991). Seasonal variation of 15N/14N ratios in atmospheric nitrate species. Tellus B. 43(1). 30–30. 158 indexed citations

Freyer, H. D., et al.. (1983). ¹³C/¹²C records in northern hemispheric trees during the past 500 years—Anthropogenic impact and climatic superpositions. Journal of Geophysical Research Atmospheres. 88(C11). 6844–6852. 143 indexed citations

Freyer, H. D.. (1981). Recent 13C/12C trends in atmospheric CO2 and tree rings. Nature. 293(5834). 679–680. 12 indexed citations

Freyer, H. D.. (1979). On the 13C record in tree rings. Part I. 13C Variations in northern hemispheric trees during the last 150 years. Tellus A Dynamic Meteorology and Oceanography. 31(2). 124–124. 83 indexed citations

Freyer, H. D.. (1979). On the¹³C record in tree rings. Part II. Registration of microenvironmental CO₂and anomalous pollution effect. Tellus. 31(4). 308–312. 21 indexed citations

Freyer, H. D.. (1979). On the¹³C record in tree rings. Part I.¹³C Variations in northern hemispheric trees during the last 150 years. Tellus. 31(2). 124–137. 39 indexed citations

Freyer, H. D.. (1978). Degradation products of organic matter in evaporites containing trapped atmospheric gases. Chemical Geology. 23(1-4). 293–307. 6 indexed citations

Freyer, H. D.. (1978). Seasonal trends of NH+4 and NO-3 nitrogen isotope composition in rain collected at Jülich, Germany. Tellus A Dynamic Meteorology and Oceanography. 30(1). 83–83. 71 indexed citations

10.

Freyer, H. D.. (1978). Preliminary15N studies on atmospheric nitrogenous trace gases. Pure and Applied Geophysics. 116(2-3). 393–404. 39 indexed citations

11.

Freyer, H. D.. (1978). Seasonal trends of NH⁺₄and NO⁻₃nitrogen isotope composition in rain collected at Jülich, Germany. Tellus. 30(1). 83–92. 173 indexed citations

12.

Freyer, H. D. & K. Kobel. (1975). Liquid helium freezing technique for isotopic analysis of μl samples of inert gases. Journal of Physics E Scientific Instruments. 8(9). 712–713. 4 indexed citations

13.

Freyer, H. D. & K. Wagener. (1975). Review on present results on fossil atmospheric gases trapped in evaporites. Pure and Applied Geophysics. 113(1). 403–418. 6 indexed citations

14.

Freyer, H. D., et al.. (1975). Anthropogenic carbon-13 decrease in atmospheric carbon dioxide as recorded in modern wood. OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information). 5 indexed citations

15.

Freyer, H. D., et al.. (1974). Dendrochronology and 13C content in atmospheric CO2. Nature. 252(5485). 757–757. 21 indexed citations

16.

Freyer, H. D., et al.. (1974). Nitrogen‐15 Variations in Fertilizer Nitrogen. Journal of Environmental Quality. 3(4). 405–406. 90 indexed citations

17.

Freyer, H. D., et al.. (1973). 13C-Decrease in modern wood due to the large-scale combustion of fossil fuels. Die Naturwissenschaften. 60(11). 517–518. 15 indexed citations

18.

Wagener, K., H. D. Freyer, & Β. A. Bilal. (1971). Counter-current Electrophoresis. Separation Science. 6(4). 483–503. 8 indexed citations

19.

Freyer, H. D. & K. Wagener. (1967). Electrochemical Processes for the Enrichment of Isotopes. Angewandte Chemie International Edition in English. 6(9). 757–766. 1 indexed citations

20.

Freyer, H. D. & K. Wagener. (1967). Elektrochemische Verfahren zur Isotopen‐Anreicherung. Angewandte Chemie. 79(17-18). 734–744. 3 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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