DOI: 10.1366/0003702991946578. Spectroscopy of Hydrothermal Reactions. Part XI: Infrared Absorptivity of CO<sub>2</sub> and N<sub>2</sub>O in Water at Elevated Temperature and Pressure

Spectroscopy of Hydrothermal Reactions. Part XI: Infrared Absorptivity of CO2 and N2O in Water at Elevated Temperature and Pressure

10.1366/0003702991946578

Crossref journal-article

SAGE Publications

Applied Spectroscopy (179)

Abstract

The temperature dependence of the infrared absorptivity of the asymmetric stretch of CO2 and N2O dissolved in H2O was determined at 300–600 K under 275 atm. These results are essential for using these species as internal calibrants of the rate of many hydrothermal reactions by infrared spectroscopy. The absorptivity (band area) for ν3(CO2) at constant number density increases from 1.58 × 104 cm/mmol at 300 K to 2.68 × 104 cm/mmol at 600 K. The absorptivity of ν3(N2O) is 8.57 × 103 cm/mmol at 300 K and 1.33 × 104 cm/mmol at 525 K. The absorptivity is suppressed in the presence of H2O by a factor of about 5 compared to results for the gas phase. The absorptivity increases, however, with increasing temperature in H2O solution, which is opposite the trend for the gas phase. The Lorentzian line shape in H2O solution provides a global relaxation time of <1 ps, which is more consistent with relaxation by vibrational energy transfer among associated molecules than by collisions or stochastic modulation by the surrounding H2O field.

Bibliography

Maiella, P. G., Schoppelrei, J. W., & Brill, T. B. (1999). Spectroscopy of Hydrothermal Reactions. Part XI: Infrared Absorptivity of CO2 and N2O in Water at Elevated Temperature and Pressure. Applied Spectroscopy, 53(3), 351â355.

Authors 3

P. G. Maiella (first)
J. W. Schoppelrei (additional)
T. B. Brill (additional)

References 29 Referenced 36

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{'volume-title': 'Carbon Dioxide Equilibria and Their Applications', 'year': '1991', 'author': 'Butler J. N.', 'key': 'bibr13-0003702991946578'} / Carbon Dioxide Equilibria and Their Applications by Butler J. N. (1991)
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Dates

Type	When
Created	21 years, 10 months ago (Oct. 17, 2003, 12:32 p.m.)
Deposited	5 months, 2 weeks ago (March 10, 2025, 8:28 p.m.)
Indexed	5 months, 2 weeks ago (March 11, 2025, 12:41 a.m.)
Issued	26 years, 5 months ago (March 1, 1999)
Published	26 years, 5 months ago (March 1, 1999)
Published Online	26 years, 5 months ago (March 1, 1999)
Published Print	26 years, 5 months ago (March 1, 1999)

Funders 0

None

BibTeX

@article{Maiella_1999, title={Spectroscopy of Hydrothermal Reactions. Part XI: Infrared Absorptivity of CO2 and N2O in Water at Elevated Temperature and Pressure}, volume={53}, ISSN={1943-3530}, url={http://dx.doi.org/10.1366/0003702991946578}, DOI={10.1366/0003702991946578}, number={3}, journal={Applied Spectroscopy}, publisher={SAGE Publications}, author={Maiella, P. G. and Schoppelrei, J. W. and Brill, T. B.}, year={1999}, month=mar, pages={351–355} }

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  "abstract": "<jats:p> The temperature dependence of the infrared absorptivity of the asymmetric stretch of CO<jats:sub>2</jats:sub> and N<jats:sub>2</jats:sub>O dissolved in H<jats:sub>2</jats:sub>O was determined at 300\u2013600 K under 275 atm. These results are essential for using these species as internal calibrants of the rate of many hydrothermal reactions by infrared spectroscopy. The absorptivity (band area) for \u03bd<jats:sub>3</jats:sub>(CO<jats:sub>2</jats:sub>) at constant number density increases from 1.58 \u00d7 10<jats:sup>4</jats:sup> cm/mmol at 300 K to 2.68 \u00d7 10<jats:sup>4</jats:sup> cm/mmol at 600 K. The absorptivity of \u03bd<jats:sub>3</jats:sub>(N<jats:sub>2</jats:sub>O) is 8.57 \u00d7 10<jats:sup>3</jats:sup> cm/mmol at 300 K and 1.33 \u00d7 10<jats:sup>4</jats:sup> cm/mmol at 525 K. The absorptivity is suppressed in the presence of H<jats:sub>2</jats:sub>O by a factor of about 5 compared to results for the gas phase. The absorptivity increases, however, with increasing temperature in H<jats:sub>2</jats:sub>O solution, which is opposite the trend for the gas phase. The Lorentzian line shape in H<jats:sub>2</jats:sub>O solution provides a global relaxation time of &lt;1 ps, which is more consistent with relaxation by vibrational energy transfer among associated molecules than by collisions or stochastic modulation by the surrounding H<jats:sub>2</jats:sub>O field. </jats:p>",
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