Corrections to the Raman fundamental band of N<sub>2</sub> and O<sub>2</sub> due to molecular non-rigidity: computations and experiment

Borysow, Jacek; Capek, Tyler; Mazzoleni, Cláudio; Moraldi, Massimo

doi:10.1080/00268976.2019.1663287

Cited by 3 publications

(5 citation statements)

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“…There is no theoretical basis for temperature dependence of b 0 , though experimental work should be performed to confirm this theoretical prediction [30][31][32]. Typically, experiments to determine b 0 are performed at room temperature, and these measurements are in-turn used to determine temperature at different temperature regimes [25,28,42,43]. It has been shown that these room temperature determined b 0 values do improve the accuracy of temperature measurements at flame temperatures [12,22].…”

Section: Generalizing the Resultsmentioning

confidence: 99%

“…The rigid-rotor approximation assumes that there is no vibrational-rotational coupling during a vibro-rotational transition. It has been shown, however, that this is not the case for the vibro-rotational spectrum of N 2 and O 2 [25,28,30,31]. These works showed that the ratios of S-and O-Branch line intensities with the same initial rotational state diverged from the rigid rotor approximation.…”

Section: Temperature Dependence Of the Non-rigid Diatomic Moleculementioning

confidence: 97%

“…We used a half waveplate (WP) to rotate the laser's polarization to be perpendicular to the detector. This ensured that only the depolarized component of the Raman scattered reached the spectrograph [20,28]. This had the effect of reducing the intensity of the Q-branches of each gas species and all their isotopologues without affecting the intensity of the S-and O-Branches.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…where β e and β e are the polarizability anisotropy and its first derivative at the equilibrium inter-nuclear distance r e . Recently, we reported new, more accurate, measurements of b 0 obtained from Raman spectra of fundamental bands of molecular O 2 and N 2 [28]. We report these values in Table 2.…”

Section: Temperature Dependence Of the Non-rigid Diatomic Moleculementioning

confidence: 99%

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Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

et al. 2020

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We demonstrate precise determination of atmospheric temperature using vibro-rotational Raman (VRR) spectra of molecular nitrogen and oxygen in the range of 292–293 K. We used a continuous wave fiber laser operating at 10 W near 532 nm as an excitation source in conjunction with a multi-pass cell. First, we show that the approximation that nitrogen and oxygen molecules behave like rigid rotors leads to erroneous derivations of temperature values from VRR spectra. Then, we account for molecular non-rigidity and compare four different methods for the determination of air temperature. Each method requires no temperature calibration. The first method involves fitting the intensity of individual lines within the same branch to their respective transition energies. We also infer temperature by taking ratios of two isolated VRR lines; first from two lines of the same branch, and then one line from the S-branch and one from the O-branch. Finally, we take ratios of groups of lines. Comparing these methods, we found that a precision up to 0.1 K is possible. In the case of O2, a comparison between the different methods show that the inferred temperature was self-consistent to within 1 K. The temperature inferred from N2 differed by as much as 3 K depending on which VRR branch was used. Here we discuss the advantages and disadvantages of each method. Our methods can be extended to the development of instrumentation capable of non-invasive monitoring of gas temperature with broad potential applications, for example, in laboratory, ground-based, or airborne remote sensing.

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Section: Generalizing the Resultsmentioning

confidence: 99%

Section: Temperature Dependence Of the Non-rigid Diatomic Moleculementioning

confidence: 97%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Temperature Dependence Of the Non-rigid Diatomic Moleculementioning

confidence: 99%

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Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

et al. 2020

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“…The first is the inclusion of states with vibrational quantum number v > 0, giving a degree of asymmetry to each rotational Raman peak. The second is the increasing polarizability anisotropy with v > 0 (spectroscopic data from [3][4][5]). For CO 2 , we implement the temperature dependent apparent nuclear degeneracy as described in [6].…”

Section: Raman Fittingmentioning

confidence: 99%

Supplementary document for Quantitative probing of atomic oxygen with spontaneous Raman scattering - 5127349.pdf

van de Steeg,

Vialetto,

Silva

et al. 2021

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This supplemental information consists of three parts, first the high-temperature Raman spectrum generation is discussed, then the validity of two main assumptions of this work are assessed. These assumptions are conservation of stoichiometry and the detectability of all species by Raman scattering. The validity of these assumptions is assessed in this SI. Detectability of all species is argued on basis of spectral signatures, while the importance of demixing is assessed with a 1D fluid model.

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Measurement and simulation of temperature-dependent spontaneous Raman scattering of O2 including P and R branches

Lill

Dieter

Koschnick

et al. 2023

Journal of Quantitative Spectroscopy and Radiative Transfer

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Corrections to the Raman fundamental band of N₂ and O₂ due to molecular non-rigidity: computations and experiment

Cited by 3 publications

References 24 publications

Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

Supplementary document for Quantitative probing of atomic oxygen with spontaneous Raman scattering - 5127349.pdf

Measurement and simulation of temperature-dependent spontaneous Raman scattering of O2 including P and R branches

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Corrections to the Raman fundamental band of N2 and O2 due to molecular non-rigidity: computations and experiment

Cited by 3 publications

References 24 publications

Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

Toward Non-Invasive Measurement of Atmospheric Temperature Using Vibro-Rotational Raman Spectra of Diatomic Gases

Supplementary document for Quantitative probing of atomic oxygen with spontaneous Raman scattering - 5127349.pdf

Measurement and simulation of temperature-dependent spontaneous Raman scattering of O2 including P and R branches

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Corrections to the Raman fundamental band of N₂ and O₂ due to molecular non-rigidity: computations and experiment