John Hayes
Senior Scientist
Director, National Ocean Sciences
Accelerator Mass Spectrometry Facility
jhayes@whoi.edu

Complete Listing of Publications (pdf version)
Curriculum Vitae (pdf version)

Education:
B.S. Iowa State University, 1962, Chemistry
Ph.D. Massachusetts Institute of Technology,
1966, Analytical Chemistry

Research interests:
Factors controlling the isotope composition (13C, 14C, 2H, 15N, 34S) of organic materials in marine environments; construction of ancient conditions (pCO2, trophic structure) from isotopic compositions of organic compounds in sediments; development of the global carbon cycle over geologic time; techniques of isotope analysis.

Papers and Data Online:

1. "Fractionation of the isotopes of carbon and hydrogen in biosynthetic processes," (pdf version)
   John M. Hayes, 23 August 2001
   A chapter which will appear in Stable Isotopic Geochemistry, John W. Valley and David R. Cole (eds.). That volume will be published in the series Reviews in Mineralogy and Geochemistry, edited by Paul H. Ribbe and now published jointly by the Mineralogical Society of America and the Geochemical Society.
   
   
2. "Practice and Principles of Isotopic Measurements in
   Organic Geochemistry" (pdf version)
   John M. Hayes, edited by Alex Sessions, Revision 2, August 2002,
   Teaching notes related to isotopic analyses includes updated versions of  "Practice and Principles of Isotopic Measurements in Organic Geochemistry," notes regarding primary standards of stable-isotopic abundances, a derivation and explanation of "Limits on the Precision of Mass Spectrometric Measurements of Isotope Ratios," a discussion of uncertainties in blank-corrected isotopic analyses, and some recent notes regarding the definition of delta and why not to call that variable "del."
    
   "An Introduction to Isotopic Calculations"  (pdf version) provides amore detailed introduction to isotopic calculations. It includes explicit derivations of various Rayleigh-distillation approximations, evaluation of the related errors, and discussions of the following modes of isotopic fractionation: Reversible reaction, closed system; Irreversible reaction, closed system; Reversible reaction, open system (product lost); Reversible or irreversible reaction, open system at steady state; and Irreversible reaction, open system (product accumulated).
   
   
3. Carbon-isotopic records from the paper: John M. Hayes, Harald Strauss, and Alan J. Kaufman. The Abundance of 13C in Marine Organic Matter and Isotopic fractionation in the Global Biogeochemical Cycle of Carbon During the Past 800 Ma. Chemical Geology 161, 103-125 (1999). Two formats are available.
   
   • Comma-separated values. These are three separate, short files. They work very well if opened using a spreadsheet program. They can also be opened using a text editor. If the latter approach is taken, special care is necessary, since blank cells (marked by adjacent commas) might be easily overlooked. The filenames are kcenrecs, pzrecs, and nprecs and cover the Cretaceous and Cenozoic, the Jurassic through Cambrian, and the Neoproterozoic, respectively.
   
   pzrecs.csv
   kcenrecs.csv
   nprecs.csv
   
   
   • A WinZip-compressed Excel-97 spreadsheet. This spreadsheet does not include any embedded formulas (all of the calculations are reported in the text of the paper) but does preserve a bit of formatting (Greek characters, for example) that is lost in the csv files.
     jmh.zip