	The Smithsonian Astrophysical Observatory Far-Infrared Spectroscopy Group
	March 11, 1999

SAO database update:

This is the database that we maintain at the Smithsonian Astrophysical Observatory for the analysis of atmospheric measurements (primarily balloon-borne) made with the FIRS-2 spectrometer system. FIRS-2 currently measures OH, HO2, H2O, H2O2, O, O2, O3, HF, HCl, HOCl, ClNO3, HBr, HOBr (upper limits), NO2, N2O, HNO3, N2O5, CO2, CO, HCN, HNO4, CFC11, CFC12, HCFC22, CCL4, SF6, OCS, and CH4.

This database combines the best currently available line parameters from 10-800 cm-1, including the HITRAN92 listing [1], the JPL listing [2], and other available measurements and calculations. The database is now supported in the HITRAN 100 character format (SAO92A); the 80 character format (SAO92) is no longer supported.

100 character database:

I2 I1 F12.6 E10.3 E10.3 F5.4 F5.4 F10.4 F4.2 F8.5 I3 I3 A9 A9 3I1 3I2
a  b  c     d     e     f    g    h     i    j    k  l  m  n  o   p

a. Molecule number
b. Isotope number (1 = most abundant, etc.)
c. Position (cm-1)
d. Intensity (cm) at 296 K
e. Transition probability (Debye**2)
f. Air-broadened HWHM (cm-1 atm-1 at 296 K)
g. Self-broadened HWHM (cm-1 atm-1 at 296 K)
h. Lower state energy (cm-1)
i. Coefficient of temperature dependence for air-broadened HWHM:
  (gamma = gamma0 * (296 / T)**n)
j. Either the pressure shift (cm-1 atm-1) or line-coupling coefficients
k. Upper state global quanta index (ref 1, 2)
l. Lower state global quanta index (ref 1, 2)
m. Upper state local quanta (ref 1, 2)
n. Lower state local quanta (ref 1, 2)
o. accuracy indices (ref 1, 2)
p. Indices for lookup of references (ref 1, 2)

The molecule numbering follows the HITRAN convention for molecules 1-28, with additional molecules defined as 29-39. Numbers 35, 37 and 38 are DUMMY molecules, to be used when you need dummy lines. Unless otherwise noted, isotope ratios have been adopted from HITRAN.

The contents of the various molecule files are as follows:

H2O (molecule 1)

161 isotopic species only, including hot bands. All values are from HITRAN92 except that term values from Toth [3] are used to update positions to the extent possible.

CO2 (molecule 2)

All values from HITRAN92, strength cutoff S(296) >= 1.0E-25 cm added.

O3 (molecule 3)

666 isotopic species, vibrational ground state; all values from HITRAN92.

N2O (molecule 4)

The rotational lines are from HITRAN92. Positions and intensities for the nu_2 fundamental (all isotopomers), and hot bands are from J. W. C. Johns and M. Weber (private communication, 1995); the pressure broadening from HITRAN92 is retained for these bands, because it has only been re-measured for N2 broadening and the potential differences between new measurements and HITRAN values are almost negligible. The difference band (100 - 010) is retained from HITRAN92.

CO (molecule 5)

Positions for 12C16O fundamental from TuFIR work [4]; everything else from HITRAN92

CH4 (molecule 6)

HITRAN92, S(296) >= 1.0E-27

O2 (molecule 7)

Pressure-broadening from HITRAN92. All other parameters from JPL, as of 11 April 1994.

NO (molecule 8)

HITRAN92

SO2 (molecule 9)

HITRAN92, S(296) >= 1.0E-21. This cutoff deletes all lines between 90.73 and 466.60 cm-1.

NO2 (molecule 10)

HITRAN92

NH3 (molecule 11)

HITRAN92, S(296) >= 1.0E-20.

HNO3 (molecule 12)

HITRAN92 + 3 hot/difference bands; HNO3 is currently under construction.

OH (molecule 13)

All parameters except pressure broadening are from JPL, as of 11 April 1994. Pressure broadening set to 0.0821 cm-1 atm-1 [5] for all lines except that those values measured in [6] and [7] are substituted for the respective ground vibration lines of 16OH (the value from [6] is used for the 83 cm-1 lines). The temperature coefficient for broadening of all lines is set to 0.94 based upon the measurements in [6].

HF (molecule 14)

TuFIR positions up to R4 [8], HITRAN92 above; strengths from SAO calculation; widths and their temperature dependences are from Pine and Looney [9]. All hot band parameters are from HITRAN92.

HCl (molecule 15)

TuFIR positions [8], strengths from SAO calculation up to R11 (these include quadrupole splitting); HITRAN92 (which does not include quadrupole) above. Widths and their temperature dependences from [9] up to R10; HITRAN92 above. All hot band parameters are from HITRAN92.

HBr (molecule 16)

Positions for fundamental below 200 cm-1 from TuFIR measurements [10]; higher fundamental and all hot band position from HITRAN92. Strengths for rotational fundamental from dipole moment calculation; hot band strengths from HITRAN92. All widths from HITRAN92.

HI (molecule 17)

HITRAN92

ClO (molecule 18)

HITRAN92

OCS (molecule 19)

HITRAN92

H2CO (molecule 20)

HITRAN92, S(296) >= 1.0E-22.

HOCl (molecule 21)

Positions for most (i.e., the strongest) lines calculated from [11]; the rest are from HITRAN92. All strengths and widths from HITRAN92.

N2 (molecule 22)