Infrared absorption spectroscopy of CO2-Ar complexes

Sharpe, Steven W.; Sheeks, R.; Wittig, C.; Beaudet, Robert A.

doi:10.1016/0009-2614(88)85287-4

Cited by 61 publications

(25 citation statements)

References 21 publications

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“…Weakly bound complexes containing Ar atoms and carbon dioxide molecules are amongst the van der Waals systems, the most studied at both laboratory [1][2][3][4][5][6][7] and theoretical levels [8][9][10][11]. Much attention paid to the investigation of these complexes is in part due to the fact that a relatively simple prototype system containing one atom and a linear molecule bears characteristics typical of many other small and medium size van der Waals aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…An early microwave study [1] made it possible to characterize the Ar-CO 2 dimers ground state spectroscopic constants and geometry. Later, infrared laser probing of the X-CO 2 (X = He, Ar, CO 2 ) dimers [2][3][4][5][6][7]12,13] have provided a wealth of experimental information for the modelling of intermolecular potentials as well as for the deciphering of the vibrational excitation effect on the spectra and structure. The breakthrough in the studies of the carbon dioxide dimer is marked by the establishment of its parallel sheared configuration following the detection of rotationally resolved IR dimer spectra [12,13] with the use of diode lasers or difference frequency laser sources.…”

Section: Introductionmentioning

confidence: 99%

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Direct FTIR high resolution probe of small and medium size Arn(CO2)m van der Waals complexes formed in a slit supersonic expansion

Thiévin¹,

Cadudal²,

Georges³

et al. 2006

Journal of Molecular Spectroscopy

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct FTIR high resolution probe of small and medium size Arn(CO2)m van der Waals complexes formed in a slit supersonic expansion

Thiévin¹,

Cadudal²,

Georges³

et al. 2006

Journal of Molecular Spectroscopy

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“…The FT-IR spectra at room temperature, and 250, 300, and 350 • C, are shown in Fig. 3b 1610 cm −1 are related to CO 2 [32,33] and NH 3 [34], respectively. The absorption bands at 2204 and 1233 cm −1 correspond to isocyanic acid (HNCO) [35].…”

Section: Possible Mechanism Of Synergetic Inhibitionmentioning

confidence: 99%

Synergetic inhibition of PCDD/F formation from pentachlorophenol by mixtures of urea and calcium oxide

et al. 2016

Journal of Hazardous Materials

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h i g h l i g h t s• Mixed CaO/urea have a synergetic inhibition effect for PCDD/Fs formation from PCP.• 5-20% urea reaction systems obtained the better synergetic inhibition effect.• 2,3,7,8-PCDD congeners were the dominant products in eight reaction systems.• Intermediates could promote the acid-base reaction to realize synergetic inhibition. a r t i c l e i n f o b s t r a c tChlorophenols are structurally similar to PCDD/Fs and have been considered as highly potential precursors for PCDD/Fs formation. The suppressing effects of PCDD/F formation from pentachlorophenol (PCP) were investigated on various mass ratios of CaO and urea. The total concentration of 2,3,7,8-PCDD/Fs, mostly dominated by OCDD, was determined to be 48.58-10186 ng/mg in inhibitor-reaction systems, being much lower than that in blank reaction system (75654 ng/mg). Interestingly, compared with pure CaO and urea reaction system, the concentration and TEQ of formed 2,3,7,8-PCDD/Fs in mixed urea/CaO reaction system were lower, especially with 5-20% urea reaction systems being respectively at decrease by 96.5-99.4% and 99.2-99.7%. The suppression efficiency of TEQ in 5-20% urea reaction systems could be always approximately 100% under 250-350• C. These results suggested that mixed inhibitors, especially 5-20% urea inhibitors, have a synergetic inhibition effect for PCDD/Fs formation from PCP. Mixed inhibitor generated several intermediates, involving CO 2 , H 2 O, NH 3 , Ca(OH) 2 , CaCO 3 , HNCO, biuret and ammelide. The complex between PCP and Ca, N-doped species, lower chlorinated phenols and benzenediol, and organic acids were also determined. Synergetic inhibition mechanism may be attributed to accelerated facilitation of acid-base reaction and N doping. The decomposition of PCP itself also contributes to prevent PCDD/Fs formation.

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“…Sharpe et al used in their work a 10 kH z triangular waveform m odulation of the T D L wavelength for pulsed jet measurements of the A r -C 0 2 absorption spectrum [7]. Later, however, they did choose the fast scanning technique [8,9], which is more effective in the case of slit jets with repetition frequencies of the order of one Hz.…”

Section: Introductionmentioning

confidence: 99%

Double Modulation Technique in Pulsed Jet Experiments with Tunable Diode Lasers

Hepp

Philipp

et al. 1994

Zeitschrift Für Naturforschung A

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A double modulation technique was used to achieve higher sensitivity in absorption measure ments with a pulsed supersonic jet. The wavelength of a lead-salt diode laser was modulated at a frequency of 10 kHz and detected at twice the frequency by a lock-in amplifier, reducing significantly the influence of the low frequency excess laser noise. The output of this lock-in amplifier was measured by a boxcar integrator, driven at 80 Hz, the frequency of the pulsed jet. In case the duration of the jet pulse is long enough, a second lock-in amplifier can also be used instead of the boxcar integrator. The optical path of the diode laser radiation through the jet was increased 16 times by using White type multireflection optics. The achieved value for the minimum detectable absorption of A r-C O complexes in the jet was 2 x 10-5 in relative absorption, limited by the excess noise of the diode laser.

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Infrared absorption spectroscopy of CO2-Ar complexes

Cited by 61 publications

References 21 publications

Direct FTIR high resolution probe of small and medium size Arn(CO2)m van der Waals complexes formed in a slit supersonic expansion

Direct FTIR high resolution probe of small and medium size Arn(CO2)m van der Waals complexes formed in a slit supersonic expansion

Synergetic inhibition of PCDD/F formation from pentachlorophenol by mixtures of urea and calcium oxide

Double Modulation Technique in Pulsed Jet Experiments with Tunable Diode Lasers

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