Experimental Line Parameters of the Oxygen A Band at 760 nm

Brown, Linda R.; Plymate, C.

doi:10.1006/jmsp.1999.8012

Cited by 126 publications

(140 citation statements)

References 46 publications

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“…Assuming that the broadening of the b 1 R þ g a 1 D g (0,0) band can be taken as the average of these two bands and that the experimental results can be extrapolated down to our 20 Torr experimental pressure, the rotational level average values reported by Cheah et al [7] yield a Lorentzian width of 0.0020 cm À1 . Similarly, Brown and Plymate [20] and Newman et al [6] derived rotational level specific broadening coefficients for the b 1 R þ g X 3 R À g ð0; 0Þ and a 1 D g X 3 R À g ð0; 0Þ bands, respectively. These coefficients yield a value of 0.0024 cm À1 for the Lorentzian full width of the Q(12) transition due to pressure broadening.…”

Section: Resultsmentioning

confidence: 98%

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Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Gupta¹,

Owano²,

Baer³

et al. 2004

Chemical Physics Letters

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Section: Resultsmentioning

confidence: 98%

“…No studies have been performed that report the pressure-induced shifts and widths of these lines. However, some recent detailed studies involving the b 1 [7,20] and a 1 D g X 3 R À g IR atmospheric [6,7] bands have been reported. These studies were performed at pressures ranging from $100 to $760 Torr.…”

Section: Resultsmentioning

confidence: 99%

Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Gupta¹,

Owano²,

Baer³

et al. 2004

Chemical Physics Letters

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“…As can be seen in Fig. 1(a), the RR transitions for each isotopologue exhibit minimal 17 O-containing isotopologues with fit uncertainties. Each experimental Gaussian width was determined by a Levenberg-Marquardt least-squares fit using a single Voigt line shape with the pressure-broadening parameter constrained to the previously determined 16 O 2 value [12].…”

mentioning

confidence: 78%

“…Spectra were fit using Voigt line-shape profiles, which account for pressure (Lorentzian) and Doppler (Gaussian) broadening. The importance of using the Galatry [15] line profile for high-resolution measurements at higher pressures is well established [16,17]; however, due to the low pressures of this study, Dicke narrowing [18] is less than 1 MHz and was therefore neglected. During the fit, the transition position and intensity were floated while the pressure broadening coefficient was constrained to the 16 O 2 known values [12].…”

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confidence: 99%

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Cavity ring-down spectroscopy measurements of sub-Doppler hyperfine structure

et al. 2010

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Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was used to measure magnetic dipole transitions in the b 1 + g ← X 3 − g (0,0) band of O 2 . The 17 O-containing isotopologues show unresolved hyperfine structure due to magnetic hyperfine splitting in the ground state. The sensitivity and stability of FS-CRDS allow for quantitative sub-Doppler measurements of the hyperfine constants, even when the hyperfine splittings are much smaller than the Doppler width. Unlike saturation spectroscopy, this linear absorption technique can be applied to weak transitions and employed to quantitatively measure intensities and line shapes. This method may be an attractive approach for measuring unresolved hyperfine structure in excited electronic states. Recent advances in near-infrared spectroscopy have enabled measurements with frequency precision previously only possible in the microwave regime [1][2][3]. Unfortunately, large near-infrared Doppler widths often obscure any hyperfine structure. While saturation spectroscopy can resolve individual hyperfine components [2,4], it is by its very nature a nonlinear technique. As a result, saturation spectroscopy leads to distortion of the spectral line shape and cannot be employed to quantitatively measure line-shape parameters [5][6][7]. In addition, saturation spectroscopy is less general than traditional absorption spectroscopy and cannot easily be applied to the study of weak transitions, such as those described herein.Here we describe an alternate approach to the measurement of hyperfine structure in the near-infrared region: the use of a linear and highly sensitive cavity ring-down spectrometer. In particular, the hyperfine splitting of the 17 O-containing isotopologues of O 2 were measured for magnetic dipole transitions in the b 1 + g ← X 3 − g (0,0) band. While individual hyperfine transitions are unresolved, the spectra exhibit a sufficiently large signal-to-noise ratio to enable quantitative measurements of hyperfine coupling constants. We note that despite the large number of recent studies which have measured spectroscopic parameters of the b 1 + g ← X 3 − g (0,0) band for 16 O 2 and the rare isotopologues [9], observation of hyperfine splitting has not previously been reported.Measurements were made using the frequency-stabilized cavity ring-down spectrometer (FS-CRDS) located at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD. The FS-CRDS system has been described in detail previously [10,11], and therefore only the most important details are given. FS-CRDS differs from other single-mode cw-CRDS spectroscopies by actively stabilizing the intracavity length to an external frequency reference. This length stabilization in turn stabilizes the cavity's free spectral range (FSR). The probe laser frequency is then stepped between successive TEM 00 cavity modes, resulting in an accurate, stable, and linear frequency axis. FS-CRDS has been utilized to measure transition frequencies to better than 0.5 MHz [1] and line intensities to bet...

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Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments

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Sahlberg

Aldén

et al. 2021

J Raman Spectroscopy

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We present an in-depth investigation of laser-induced grating spectroscopy (LIGS) for temperature measurements in practical applications using a narrow-band dye laser with 760 nm wavelength and a pulse duration of 8 ns as the source for the pump beams creating the laser-induced grating. The pump laser wavelength was set to be either resonant with the R Q 5 ð Þ transition from the b 1 Σ + g υ 0 = 0 ð Þ X 3 Σ − g υ 00 = 0 ð Þ band of O 2 for generation of thermal LIGS or nonresonant for generation of purely electrostrictive LIGS. Signals were generated in ambient air as well as in high-pressure or high-temperature dry air mixtures. Pump laser irradiances up to 11 GW/cm 2 were used, which resulted in strong electrostrictive contribution to the overall LIGS signals at atmospheric pressure, with a low thermal contribution due to the weak absorption by the singlet O 2 b 1 Σ + g , v 0 = 0. The advantage and disadvantage of thermal or electrostrictive LIGS for temperature measurements are discussed, as well as potential applications in high-pressure environments. Furthermore, the precision of the temperature measurement is discussed by comparing different analysis methods.

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Experimental Line Parameters of the Oxygen A Band at 760 nm

Cited by 126 publications

References 46 publications

Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Cavity ring-down spectroscopy measurements of sub-Doppler hyperfine structure

Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments

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Experimental Line Parameters of the Oxygen A Band at 760 nm

Cited by 126 publications

References 46 publications

Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Quantitative determination of singlet oxygen density and temperature for Oxygen-Iodine Laser Applications

Cavity ring-down spectroscopy measurements of sub-Doppler hyperfine structure

Investigation of laser‐induced grating spectroscopy of O2 for accurate temperature measurements towards applications in harsh environments

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Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments