Low pressure line-shape study of self-broadened CO transitions in the (3←0) band

Wójtewicz, Szymon; Stec, K.; Masłowski, Piotr; Cygan, A.; Lisak, D.; Trawiński, R. S.; Ciuryło, R.

doi:10.1016/j.jqsrt.2013.06.005

Cited by 34 publications

(18 citation statements)

References 74 publications

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“…The pressure shift values measured in [9,10] are in good agreement with the work of Jacquemart et al [25] but deviate systematically by about 50 kHz/mbar from those reported by Sung and Varanasi in [24]. This difference results in a systematic bias of À50 kHz on the center at zero pressure of the lines measured at 1 mbar.…”

Section: Pressure-shift Correctionssupporting

confidence: 89%

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Broadband and highly sensitive comb-assisted cavity ring down spectroscopy of CO near 1.57µm with sub-MHz frequency accuracy

Mondelain

Sala

Kassi

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Section: Pressure-shift Correctionssupporting

confidence: 89%

“…The only previous detection for these two minor isotopologues is due to Wójtewicz et al who recently reported the line profile analysis of five lines ( 12 C 17 O R0-R2 and 12 C 18 O P15-P14) by frequency stabilized CRDS [24] (see Fig. 2).…”

Section: The 3-0 Band Of the Minor Co Isotopologuesmentioning

confidence: 99%

Broadband and highly sensitive comb-assisted cavity ring down spectroscopy of CO near 1.57µm with sub-MHz frequency accuracy

Mondelain

Sala

Kassi

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…To verify the spectral performance of the broadband system we have fitted R16e line with the cavity transmission model [14] assuming the Voigt profile (VP). The line position, line intensity and pressure shift fixed to the reference values were obtained for this line with cw FS-CRDS system available in our laboratory [24,25]. The fitted value of Lorentzian line width agrees with the sum of the FS-CRDS reference value and instrumental line-shape width (shown in Fig.…”

supporting

confidence: 67%

Broadband CO2 measurements with VIPA spectrometer in the near-infrared

Kowzan¹,

Paradowska²,

Zaborowski³

et al. 2015

Photon. Lett. Poland

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Abstract-We demonstrate near-infrared cavity-enhanced optical frequency comb spectroscopy of R branch of CO2 overtone transitions around 1.57µm. The measurement setup is based on an Er:fiber optical frequency comb, high finesse cavity and a VIPA spectrometer.A dither locking scheme provides robust operation and high absorption sensitivity enhancement, while a VIPA etalon-based spectrometer provides rapid broadband acquisition with 600 MHz spectral resolution. The sensitivity of the system reaches 2.3×10 -9 cm -1 at 2×82s acquisition time. We verify the resolution of the experimental setup by comparing the measured spectrum with the high-quality spectrum obtained with a cavity ring-down spectrometer.With the development of optical frequency comb (OFC) at the turn of the millennium the optical absorption spectroscopy obtained a versatile tool for frequency measurements [1][2][3]. When used directly to interrogate an atomic or molecular sample, the broadband spectrum of optical frequency comb offers high sensitivity in a wide spectral range, with acquisition time of the order of seconds or lower. It removes the need for stepwise tuning of a continuous wave (cw) laser, allowing to sense the absorption of tens of molecular lines simultaneously and minimize the influence of long term drifts.Multiple approaches have been demonstrated with this technique until now [4][5][6], including cavity ring-down spectroscopy [7], dual-comb spectroscopy [8][9][10], cavityenhanced Fourier Transform Spectroscopy [11,12] or noise immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) [13]. In cavityenhanced measurements, the overlap between OFC and cavity modes is ensured by two approaches: tight lock usually performed by two-point Pound-Drever-Hall technique [11,14] and so called 'dither lock', where the cavity length is modulated so that the OFC and cavity resonances periodically coincide [15,16]. As shown before [4,17], the first approach offers the highest transmitted power and enhancement of the effective optical length (L eff =βF/π L, where F is the cavity finesse, L -the cavity length and β -an enhancement factor equal to 2 in this case), putting high demands on locking speed. The requirements of the second approach are much lower * E-mail: gkowzan@fizyka.umk.pl at the price of lower transmission and decreased effective optical length depending on locking settings. In all mentioned setups multiple approaches were used to disperse an optical frequency comb spectrum [4][5][6]. Spectrometers consisting of a virtually imaged phase array (VIPA) etalon [18][19][20], a diffraction grating and a camera are attractive because they provide rapid acquisition, limited only by the camera speed, in a compact package without any moving parts. So far, none of the presented frequency comb VIPA spectrometers have managed to combine cavity-enhanced sensitivity, broad spectral coverage, high signal-to-noise ratio, rapid acquisition and self-referenced frequency axis. This paper presents such a system built out of off-the-shel...

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“…Therefore, more advanced line profiles are required to minimise peak-area bias. Profile-dependent deviations in peak area ranging from 0.2% to 2% have been reported for CRDS measurements of carbon monoxide and water [164,168]. However, when using line profiles with at least one more degree of freedom than the Voigt, relative differences between fitted areas are nominally 0.05% and difficult to distinguish.…”

Section: Cavity Ring-down Spectroscopy and Off Axis Integrated-cavitymentioning

confidence: 98%

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

et al. 2019

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We present the global research landscape which aims to deliver a measurement infrastructure to underpin atmospheric observations of key greenhouse gases governing changes in the Earth's climate. These measurements present a significant challenge to the metrological community, analytical laboratories and major producers of reference materials. The review focuses on the progress made in the Gas Analysis Working Group of the Consultative Committee for Amount of Substance: Metrology in Chemistry and Biology (CCQM-GAWG) in establishing the primary realisation of the amount-of-substance fraction for carbon dioxide, methane and nitrous oxide in an air matrix. It also focuses on the importance of providing traceable measurements of isotopic composition of these components for commutability of reference materials and for isotope ratio measurements for greenhouse gas source attribution. Metrologia 56 (2019) 034006 (29pp) P J Brewer et al 2 of the World Meteorological Organization (WMO) for providing the framework for the development and implementation of integrated greenhouse gas observations, which is vital for understanding the global carbon cycle and the role greenhouse gases play in climate change. The developments in analytical techniques are also discussed which have shaped the direction of the metrology required to meet the evolving and future needs of stakeholders.

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Low pressure line-shape study of self-broadened CO transitions in the (3←0) band

Cited by 34 publications

References 74 publications

Broadband and highly sensitive comb-assisted cavity ring down spectroscopy of CO near 1.57µm with sub-MHz frequency accuracy

Broadband and highly sensitive comb-assisted cavity ring down spectroscopy of CO near 1.57µm with sub-MHz frequency accuracy

Broadband CO2 measurements with VIPA spectrometer in the near-infrared

Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations

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