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HITRAN Database: Comprehensive Molecular Spectroscopy for Astrophysics Research

Explore the HITRAN database for accurate line-by-line parameters and cross-sections of various molecules. Access the JavaHAWKS software for data manipulation and plot generation.

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HITRAN Database: Comprehensive Molecular Spectroscopy for Astrophysics Research

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  1. The HITRAN Database Laurence S. Rothman Iouli E. Gordon Harvard-Smithsonian Center for Astrophysics Atomic and Molecular Physics Division Symposium on Laboratory Astrophysics at the CfA Cambridge, USA 20 September 2010 1

  2. PAST 2

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  5. Joseph-Marie Jacquard – 1801 Charles Babbage ~ 1820 HITRAN – 1973 Florida - 2000 5

  6. Lambert-Beers Law of Absorption: Radiation Field Coupling Matter Molecular Absorption

  7. Intensity in HITRAN database: Partition Sum: Temperature dependence of halfwidth: air (pref,T) = air (pref,Tref) (Tref /T)n Molecular Absorption (for HITRAN, Tref = 296K)

  8. HITRAN Line-by-line Parameters 160-character total 8

  9. JavaHAWKS Software Installers and Documentation Level 1 Level 2 Level 3 File Structure of HITRAN Compilation HITRAN (line-transition parameters) IR Cross-sections UV Line Coupling CO2 data Aerosol Refractive Indices Global Data Files, Tables, and References Line-by-line Cross-sections Supplemental Supplemental Alternate Molecule- by-molecule 9

  10. Species Currently Covered (line-by-line portion) 97 Isotopologues 10

  11. Species Currently Covered (IR Cross-sections) 11

  12. HITRAN evolution HITRAN law? 1995 HITEMP2010 has 125 705 570 transitions!!!!!

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  14. Global fit Methane Challenge 1.7 μm 2.3 μm new 14

  15. IUPAC Water-Vapor Task Distributed Information System • Collect all kinds of original information about the high-resolution spectroscopy of the water molecule • Provide active storage of these data and related metadata • Deliver information to users in different forms via the Internet 15

  16. IUPAC vs HITRAN Ro-vibrational levels for H217O 16

  17. Some Sources of Errors in the HITRAN Database • Theory • Perturbations • Line shapes • Lack of convergence • Limit of basis sets • Measurement • Calibration • Resolution • Photometric accuracy • Pressure, temperature, stability, … • Methods of analysis • Identification of lines • Units • Transcription 17

  18. Improvements and Enhancements to theCompilationbeing considered ►More temperature-pressure sets of cross-sections (IR and UV) ►Improved database structure (IUPAC paradigm) ►High-temperature parameters (HITEMP) ►Molecules for astrophysics applications ►Refined line-shape parameters ►Additional line-mixing algorithms ►Collision-Induced Absorption bands 18

  19. Access web site: http://cfa.harvard.edu/HITRAN • Gives instructions for accessing compilation (free) • Updates • - Documentation • - Links to related databases • - HITRAN facts • - Related conferences 19

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  21. JavaHAWKS Java version of HITRAN Atmospheric WorKStation • Functions to manipulate and filter the HITRAN and • associated molecular spectroscopic databases • Plotting of line-by-line files and cross-section files • Internet access to HITRAN and other related databases • Links to abstracts that are the sources for • HITRAN parameters • Access to archival HITRAN documentation 21

  22. HITRAN International Advisory Committee 22

  23. The END (but not for HITRAN)

  24. Typical Cross-section files CCl2F2 (CFC-12) CClF3 (CFC-13) CF4 (CFC-14) SF6 24

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