Cavity enhanced absorption spectroscopy measurements of pressure-induced broadening and shift coefficients in the υ 1+υ 3 combination band of ammonia

Bell, Claire L.; Dhib, M.; Hancock, Gus; Ritchie, Grant A. D.; Helden, J. H. van; Leeuwen, Nicola J. van

doi:10.1007/s00340-008-3238-5

Cited by 9 publications

(2 citation statements)

References 44 publications

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“…A PICARRO G1103-t NH 3 analyzer (PICARRO Inc., USA) measuring ammonia mixing ratios based on cavity ring-down spectroscopy was also connected to the CLOUD chamber during CLOUD12 and CLOUD13. The instrument is suitable for real-time monitoring of ammonia in ambient air and has been presented in previous studies (Bell et al, 2009). The G1103-t was installed at the CLOUD chamber with its own sampling line coated with Sulfinert (Restek GmbH, Germany), and the coating reduced the losses of ammonia to the sampling line walls considerably.…”

Section: Picarromentioning

confidence: 99%

Measurement of ammonia, amines and iodine compounds using protonated water cluster chemical ionization mass spectrometry

et al. 2020

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Abstract. Here we describe the design and performance of a new water cluster chemical ionization–atmospheric pressure interface time-of-flight mass spectrometer (CI-APi-TOF). The instrument selectively measures trace gases with high proton affinity such as ammonia and dimethylamine, which are important for atmospheric new particle formation and growth. Following the instrument description and characterization, we demonstrate successful measurements at the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber where very low ammonia background levels of ∼4 pptv were achieved (at 278 K and 80 % RH). The limit of detection of the water cluster CI-APi-TOF is estimated to be ∼0.5 pptv for ammonia. Although no direct calibration was performed for dimethylamine (DMA), we estimate its detection limit is at least 3 times lower. Due to the short ion–molecule reaction time and high reagent ion concentrations, ammonia mixing ratios up to at least 10 ppbv can be measured with the instrument without significant reagent ion depletion. Besides the possibility to measure compounds like ammonia and amines (dimethylamine), we demonstrate that the ionization scheme is also suitable for the measurement of trace gases containing iodine. During CLOUD experiments to investigate the formation of new particles from I2, many different iodine-containing species were identified with the water cluster CI-APi-TOF. The compounds included iodic acid and neutral molecular clusters containing up to four iodine atoms. However, the molecular structures of the iodine-containing clusters are ambiguous due to the presence of an unknown number of water molecules. The quantification of iodic acid (HIO3) mixing ratios is performed from an intercomparison with a nitrate CI-APi-TOF. Using this method the detection limit for HIO3 can be estimated as 0.007 pptv. In addition to presenting our measurements obtained at the CLOUD chamber, we discuss the applicability of the water cluster Ci-APi-TOF for atmospheric measurements.

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Section: Picarromentioning

confidence: 99%

Measurement of ammonia, amines and iodine compounds using protonated water cluster chemical ionization mass spectrometry

et al. 2020

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“…Measurements and theoretical studies of linewidths of NH 3 broadened by Ar have already been published for different bands [11][12][13][14][15]. Collisional linewidths can also be evaluated from the collisional broadening cross sections.…”

Section: Introductionmentioning

confidence: 99%

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Ayari

Loreau

Dhib

et al. 2015

Journal of Molecular Spectroscopy

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The semiclassical formalism of Robert and Bonamy is used to calculate the linewidths of rovibrational transitions of ammonia in collision with argon. Two accurate ab initio potential energy surfaces (PES) have been applied to model the NH 3 -Ar interactions. In this work and contrary to our previous calculations, the transitions with DK = ±3n (n integer) have been introduced into the expressions of the differential collision cross section S(b). Comparisons with previous theoretical and experimental studies are reported. A detailed analysis of the contribution of the various anisotropic components of the PES shows that the induced DK = ±3 transitions play a crucial role. Calculations performed in the m 4 and m 1 vibrational bands of NH 3 are in good agreement with the experimental data and correct dependences of the broadening coefficients with the rotational quantum numbers J and K are obtained.

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Buffer-gas pressure broadening for the 2ν 3 band of methane measured with continuous-wave cavity ring-down spectroscopy

et al. 2009

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Cavity enhanced absorption spectroscopy measurements of pressure-induced broadening and shift coefficients in the υ 1+υ 3 combination band of ammonia

Cited by 9 publications

References 44 publications

Measurement of ammonia, amines and iodine compounds using protonated water cluster chemical ionization mass spectrometry

Measurement of ammonia, amines and iodine compounds using protonated water cluster chemical ionization mass spectrometry

Semiclassical line broadening calculations using an ab initio potential. Application to NH 3 perturbed by argon

Buffer-gas pressure broadening for the 2ν 3 band of methane measured with continuous-wave cavity ring-down spectroscopy

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