MPG

The MPI-Mainz UV/VIS Spectral Atlas

of Gaseous Molecules of Atmospheric Interest

www.uv-vis-spectral-atlas-mainz.org

Hannelore Keller-Rudek1, Geert K. Moortgat2, Rolf Sander2, Rüdiger Sörensen1

1Satellite Group

2Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany


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When referring to the Spectral Atlas, please cite our publication:

Keller-Rudek, H., Moortgat, G. K., Sander, R., and Sörensen, R.: The MPI-Mainz UV/VIS spectral atlas of gaseous molecules of atmospheric interest, Earth Syst. Sci. Data, 5, 365–373, (2013), DOI: 10.5194/essd-5-365-2013


Cross Sections / Unclassified / VI4 / Gregory(1994)_700K_230-500nm

DATAFILE: VI4_Gregory(1994)_700K_230-500nm.txt
NAME: vanadium tetraiodide
FORMULA: VI4
AUTHOR(YEAR): Gregory(1994)
T: 700K
λ: 230-500nm
BIBLIOGRAPHY: N.W. Gregory, "UV-vis absorption spectrum of vanadium tetraiodide vapor and thermodynamicproperties of the vanadium iodides", J. Chem. Eng. Data 39, 922—925 (1994); DOI: 10.1021/je00016a065
COMMENTS: Molar extinction coefficients were derived from measured absorbances using concentrations based on the equilibrium constants for the reaction VI4(s) +I2(g) ↔ VI4(g) of

K.O. Berry, R.R Smardzewski, R.E McCarley, Inorg. Chem. 8, 1994-1997 (1969); DOI: 10.1021/ic50079a034

The temperature dependence of the extinction coefficients at 580-850 K were expressed by the empirical relation

ε(λ, T) = a + bT with the following parameters a and b:

λ    10-3 a     b
nm  L mol-1 cm-1 L mol-1 cm-1 K-1
---------------------------------------------------------
230  38.9    -24.7
240  41.5    -21.7
250  42.0    -21.0
260  36.4    -16.9
270  29.5    -12.1
280  28.3    -12.9
290  25.8    -12.0
300  19.3    -6.37
310  17.4    -6.25
320  16.2    -6.45
330  15.8    -7.07
340  16.3    -8.49
350  15.3    -8.04
360  14.6    -7.90
370  15.4    -7.33
380  13.8    -7.72
390  14.5    -8.98
400  14.0    -8.64
410  15.4    -10.7
420  15.1    -10.7
430  12.9    -8.44
440  11.9    -7.52
450  15.3    -12.0
460  4.97    -0.84
470  15.6    -12.8
480  14.7    -11.3
490  11.6    -7.37
500  23.7    -21.4

The extiction coefficients for 700 K listed in Table 1 have been converted to absorption cross sections (conversion factor 3.8235×10-21)

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