Rare Gas Pressure Broadening of the NO Fundamental Vibrational Band

Pope, Robert S.; Wolf, P.

doi:10.1006/jmsp.2001.8401

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…The pressure broadening coefficient of NO line by helium is needed for σ p calculation when pressure broadening makes a significant contribution to the line shape. The measured pressure broadening coefficient of Lorentzian half-width at half-medium for 14 NO R 3/2 (6.5) transition b = 6.9 × 10 –5 cm –1 ·Torr –1 was in good agreement with the data reported earlier …”

Section: Resultssupporting

confidence: 91%

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Detection of S-Nitroso Compounds by Use of Midinfrared Cavity Ring-Down Spectroscopy

et al. 2015

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S-nitrosocompounds have received much attention in biological research. In addition to their role as nitric oxide donors, there is a growing evidence that these compounds are involved in signaling processes in biological systems. Determination of S-nitrosylated proteins is of great importance for fundamental biological research and medical applications. The most common method to assay biological S-nitrosocompounds is to chemically or photochemically reduce SNO- functional groups to release nitric oxide that is then entrained in an inert gas stream and detected, usually through chemiluminescence. We report a method of S-nitrosocompounds detection using cavity ring-down measurements of gaseous NO absorbance at 5.2μ. The proposed method, in contrast to the chemiluminescence-based approach, can be used to distinguish isotopic forms of NO. We demonstrated sensitivity down to ~2 pmole of S-14NO groups and ~5 pmole of S-15NO groups for S-nitrosocompounds in aqueous solutions. The wide dynamic range of cavity ring-down detection allows the measurement of S-nitrosocompounds levels from pico- to nanomole amounts.

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Section: Resultssupporting

confidence: 91%

“…The measured pressure broadening coefficient of lorentzian half-width at half-medium for 14 NO R 3/2 (6.5) transition b=6.9×10 −5 cm −1 torr −1 was in good agreement with the data reported earlier. 70 …”

Section: Detection Of No and S-nitrosothiols In Flow Modementioning

confidence: 99%

Detection of S-Nitroso Compounds by Use of Midinfrared Cavity Ring-Down Spectroscopy

et al. 2015

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“…Table 2 summarizes our results at 294 K, along with the literature values of the NO (1←0) R11.5 (Ω3/2 and Ω1/2) lines from various published papers [20,[28][29][30][31]. Note that we did not convert the broadening coefficients to the same temperature (at 300 K) as those in the literature for this comparison.…”

Section: Literature Comparisonmentioning

confidence: 99%

“…For example, fixed wavelength TDLAS has been normally used in shock tube experiments, and the spectral line parameters (pressure broadening or cross-section) are essential for species quantification. The pressure-broadening coefficient of NO has been investigated by many researchers, including both theoretical and experimental aspects [16][17][18][19][20]. In 1982, Lundqvist attempted to measure the pressure-broadening coefficient for R-branch lines of NO near 5.4 µm using a computerized tunable diode laser spectrometer [17].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Pressure Broadening Coefficients of NO Lines in the 1←0 Band for N2, CO2, Ar, H2, O2 and He

et al. 2023

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A tunable diode laser absorption spectroscopy (TDLAS)-based spectrometer employing a mid-infrared (Mid-IR) interband cascade laser (ICL) was developed and used to determine pressure broadening coefficients of two NO absorption transitions at 1914.98 cm−1 and 1915.76 cm−1 in the fundamental (1←0) band (R11.5 Ω1/2 and Ω3/2) for CO2, N2, Ar, O2, He, and H2. For the first time, a reliable and consistent set of six different pressure-broadening coefficients for the NO line has been measured by a consistent approach covering pressures from 100 to 970 mbar at a temperature of 294 K. Air pressure broadening has been calculated based on N2 and O2 coefficients. The stated pressure-broadening coefficients for N2, CO2, Ar, H2, O2, He, and Air have relative errors in the 0.5–1.5% range. For CO2 and H2, broadening results of NO (1←0) band (R11.5 Ω1/2 and Ω3/2) lines are reported for the first time. The results are also compared to previously available literature data. It was found that the broadening coefficients for O2 and Air are in agreement with literature values, whereas results for Ar and He show larger differences.

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“…The broadening of the fundamental band lines by rare gases was studied in Refs [220,227]. The self-broadening coefficients of NO [219] have the same order of magnitude as the coefficients for the broadening by O 2 and N 2 , so that, for small concentrations of NO in the atmosphere, they do not influence the NO broadening by air.…”

Section: No Moleculementioning

confidence: 99%

Pressure broadening and shifting of vibrotational lines of atmospheric gases

Buldyreva¹,

Lavrentieva²,

Starikov³

2010

Collisional Line Broadening and Shifting of Atmospheric Gases

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Water vapour is one of the strongest absorbers of radiation in the Earth's atmosphere, but some other gases also play an important role in the atmospheric radiative transfer processes: carbon dioxide CO 2 , carbon monoxide CO, ozone О 3 , methane CH 4 . Minor atmospheric pollutants such as hydrogen sulphide H 2 S, methyl fluoride CH 3 F, methyl chloride CH 3 Cl, ethylene C 2 H 4 , nitric oxide NO, nitrous oxide N 2 O and nitrogen dioxide NO 2 are equally recognised for their implication in the fundamental chemical reactions occurring in the terrestrial atmosphere. As a consequence, a lot of spectroscopic studies are made for these molecules in order to obtain the line positions, intensities and widths. They are briefly summarised below, starting by asymmetric waterlike molecules of X 2 Y-type which have the same selection rules for vibrotational spectra. Vibrotational lines of asymmetric X 2 Y moleculesBetween asymmetric tops of the X 2 Y type most attention in the spectroscopic literature is paid to the H 2 S, SO 2 , O 3 and NO 2 molecules. _________________________________________________________________ A vibrotational state (v 1 v 2 v 3 ) [J K a K c ] of these molecules is characterised by three vibrational quantum numbers v 1 , v 2 , v 3 and three rotational quantum numbers J, K a , K c . In the NO 2 molecule, having an unpaired electron (total electronic spin S = 1/2), each vibrotational level is split by the spin-rotational interaction into two components (J = N ± S) denoted by + or -, and the three rotational quantum numbers are N, K a , K c . For a given set of vibrotational quantum numbers the corresponding energies are obtained by a diagonalization of the effective Hamiltonian matrix of Eq. (3.

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Rare Gas Pressure Broadening of the NO Fundamental Vibrational Band

Cited by 8 publications

References 23 publications

Detection of S-Nitroso Compounds by Use of Midinfrared Cavity Ring-Down Spectroscopy

Detection of S-Nitroso Compounds by Use of Midinfrared Cavity Ring-Down Spectroscopy

Investigations on Pressure Broadening Coefficients of NO Lines in the 1←0 Band for N2, CO2, Ar, H2, O2 and He

Pressure broadening and shifting of vibrotational lines of atmospheric gases

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