HITRAN

The HITRAN format is the format defined by the High-resolution Transmission Molecular Absorption (HITRAN) database . It has been widely adopted by the community of spectroscopists and modellers using spectrospcopic data.

Data are stored in a standardised way in formatted ASCII text files. HITRAN conventions are described on the HITRAN Database Web Site under Section "HITRAN Facts".

We have reproduced some of the tables available at the HITRAN site below for convenience.

  • Tables 1 & 2 display all fields included in one record (one line) of a HITRAN data file. Each table corresponds to a version of the HITRAN database (prior-to or after 2000).
  • Table 3 lists molecule numbers and formulæ. Isotope numbers can be found on the HITRAN Web site.
  • Table 4 displays the error codes and their meanings.
  • Table 1. Format for HITRAN Parameters, Editions 1986 through 2000 – One record includes 16 parameters and is 100 characters long
    Parameter Molecule
    number
    Isotope
    number
    Transition
    frequency
    [cm -1]
    Line
    intensity
    |R| 2 Air-
    broadened
    width
    Self-
    broadened
    width
    Lower-
    state
    energy
    Temperature
    dependence
    (of air
    width)
    Pressure
    shift
    Upper
    vibrational
    quanta
    Lower
    vibrational
    quanta
    Upper
    local
    quanta
    Lower
    local
    quanta
    Error
    code
    Reference
    code
    Field length 2 1 12 10 10 5 5 10 4 8 3 3 9 9 3 6

    Table 2. New Format for HITRAN Parameters, Editions after 2000 – One record includes 19 parameters and is 160 characters long
    Parameter Molecule
    number
    Isotope
    number
    Transition
    frequency
    [cm -1]
    Line
    intensity
    Einstein-A
    coefficient
    Air-
    broadened
    width
    Self-
    broadened
    width
    Lower-
    state
    energy
    Temperature
    dependence
    (of air
    width)
    Pressure
    shift
    Upper
    vibrational
    quanta
    Lower
    vibrational
    quanta
    Upper
    local
    quanta
    Lower
    local
    quanta
    Error
    code
    Reference
    code
    Flag
    for
    line
    mixing
    Upper
    statistical
    weight
    Lower
    statistical
    weight
    Field length 2 1 12 10 10 5 5 10 4 8 15 15 15 15 6 12 1 7 7
    FORTRAN
    descriptor
    i2 i1 f12.6 1pe10.3 e10.3 0pf5.4 f5.4 1pf10.4 0pf4.2 f8.6 a15 a15 a15 a15 6i1 6i2 a1 i7 i7

    Table 3. HITRAN molecule numbers
    # Molecule # Molecule # Molecule # Molecule # Molecule
    1 H 2O 9 SO 2 17 HI 25 H 2O2 33 HO 2
    2 CO 2 10 NO 2 18 ClO 26 C 2H2 34 O
    3 O 3 11 NH 3 19 OCS 27 C 2H6 35 ClONO 2
    4 N 2O 12 HNO 3 20 H 2CO 28 PH 3 36 NO +
    5 CO 13 OH 21 HOCl 29 COF 2 37 HOBr
    6 CH 4 14 HF 22 N 2 30 SF 6 38 C 2H4
    7 O 2 15 HCl 23 HCN 31 H 2S
    8 NO 16 HBr 24 CH 3Cl 32 HCOOH

    Table 4. HITRAN one-digit error codes
    Wavenumber [cm -1] Intensity, Halfwidths,
    Temperature dependence,
    Pressure shift
    Code Error range Code Error range
    0 > 1 cm -1 or unreported 0 Unreported or unavailable
    1 Between 1 and 0.1 cm -1 1 Default or constant
    2 Between 0.1 and 0.01 cm -1 2 Average or estimate
    3 Between 0.01 and 0.001 cm -1 3 > 20%
    4 Between 0.001 and 0.0001 cm -1 4 Between 10% and 20%
    5 Between 0.0001 and 0.00001 cm -1 5 Between 5% and 10%
    6 Better than 0.00001 cm -1 6 Between 2% and 5%
    7 Between 1% and 2%
    8 < 1%

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