Frequency and intensity measurements on the quadrupole spectrum of molecular hydrogen

Fink, Uwe; Wiggins, T. A.; Rank, D. H.

doi:10.1016/0022-2852(65)90044-5

Cited by 115 publications

(25 citation statements)

References 18 publications

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“…Fig. (6a) also shows that the Raman peak derived from the H 2 rotation is detected around 581 cm -1 in the hydrate phase, which is the strongest peak corresponding to the H 2 rotation [25]. The peak derived from the H-H stretching vibration of H 2 is detected around 4131 cm -1 in the hydrate phase as shown in Fig.…”

Section: Raman Spectroscopic Analysis For H 2 + Hydrocarbon + Water Mmentioning

confidence: 67%

Cage Occupancy of Hydrogen in Carbon Dioxide, Ethane, Cyclopropane, and Propane Hydrates

Sugahara¹,

Mori²,

Sakamoto³

et al. 2008

TOTHERJ

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Abstract:We have already reported the cage unoccupancy of hydrogen in the CO 2 hydrate from the Raman spectroscopic analysis and the thermodynamic analysis using Soave -Redlich -Kwong equation of state. On the other hand, at the low temperatures, Kim and Lee (Journal of American Chemical Society, vol. 127, pp. 9996-9997, Jul. 2005) claimed that hydrogen is enclathrated in the CO 2 hydrate. In the present study, the cage unoccupancy of hydrogen in the CO 2 hydrate was reconfirmed clearly by in situ Raman spectroscopy for single crystal of gas hydrates. Isothermal phase equilibria (pressure -composition) and Raman spectra for three ternary systems of hydrogen + hydrocarbon (ethane, cyclopropane, propane) + water with same experimental procedures as hydrogen + CO 2 + water system were measured at 276.1 K in the pressure range up to 5 MPa. In addition, the released gas from hydrates was analyzed to confirm the occupancy or unoccupancy of hydrogen at the temperature. All analyses arrive at the single conclusion that hydrogen is enclathrated in only propane hydrate under the present experimental conditions.

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Section: Raman Spectroscopic Analysis For H 2 + Hydrocarbon + Water Mmentioning

confidence: 67%

Cage Occupancy of Hydrogen in Carbon Dioxide, Ethane, Cyclopropane, and Propane Hydrates

Sugahara¹,

Mori²,

Sakamoto³

et al. 2008

TOTHERJ

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“…The whole temperature range depicted in Fig. 10 Rotational constants were taken from [14] thermometer. The best choice are transitions with strongly different slopes in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Table 1 lists the lowest rotational transitions in the vibronic groundstate of hydrogen [14]. The spectral separation of 50 ~ is presumably too large for larger molecules such as CO, 02, and N2.…”

Section: Experimental Set Upmentioning

confidence: 99%

Experimental study of vibrational and pure rotational coherent anti-stokes Raman scattering (CARS) in molecular hydrogen

et al. 1986

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Abstract. Using a specially designed excimer-laser-pumped dye laser of adjustable bandwidth high-lying pure rotational transitions of both, ortho-and para-hydrogen have been identified by coherent anti-Stokes Raman scattering (CARS). As an interesting application Hz-based CARS-thermometry is discussed. PACS: 42.65Coherent anti-Stokes Raman spectroscopy (CARS) using rotational-vibrational transitions has proven to be a powerful tool in various areas of science and technology since its first demonstration by Maker and Terhune [1]. Use of pure rotational transitions, however, has been made so far only in a few applications dealing with concentration and temperature measurements of small molecules, such as Hz, N2, 02, N20, and CO [2][3][4][5][6][7][8][9][10][11][12]. It is the purpose of this paper to demonstrate that pure rotational CARS spectroscopy in the vibronic groundstate of molecular hydrogen is a very powerful tool for the detection of small concentrations of H2, which can be utilized effectively for temperature measurements in various temperature ranges. The principal difference in terms of energy levels used for rotational and vibrational CARS of hydrogen can be explained with reference to Fig. 1, showing the typical scattering processes taking place in a CARStype experiment. The striking difference between vibrational and rotational CARS is the energy difference between the respective resonantly excited real levels, such as AEvi b for the v=0~v= 1 transition and AEro t for the J = 1 --*J = 3 transition, which turned out to be the most intense rotational transition for H 2 trace analysis under room temperature conditions. The limits of detectibility will be discussed in detail in Sect. 2.

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“…Since the first measurements of the quadrupole spectra of H 2 overtone bands by Herzberg [38] using long-path classical absorption techniques, refinements have been applied through the years, e.g. by using more accurate echelle spectrometers by Rank and co-workers [39,40,73]. The improvements continued in the study of Bragg et al [41] who employed Fourier-Transform (FT) spectroscopy techniques.…”

Section: Comparison To Previous Studiesmentioning

confidence: 96%

“…Herzberg first predicted, in 1938, that it should be possible to record rovibrational transitions in the ground state manifold [37], and later discovered the quadrupole spectrum in 1949 by photographing a total of eight lines in the (2,0) and (3,0) bands [38]. Subsequently the quadrupole spectrum including the fundamental (1,0) band was investigated by several other groups, for example by Rank and co-workers [39,40]. The measurements by Bragg et al [41] greatly improved the accuracy of the spectroscopy of the quadrupole bands and was until recent years considered as the most accurate work on the direct measurement of the vibrational splittings.…”

Section: Introductionmentioning

confidence: 99%

VUV-synchrotron absorption studies of N2 and CO at 900K

Niu

Heays

Jones

et al. 2015

Journal of Molecular Spectroscopy

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Frequency and intensity measurements on the quadrupole spectrum of molecular hydrogen

Cited by 115 publications

References 18 publications

Cage Occupancy of Hydrogen in Carbon Dioxide, Ethane, Cyclopropane, and Propane Hydrates

Cage Occupancy of Hydrogen in Carbon Dioxide, Ethane, Cyclopropane, and Propane Hydrates

Experimental study of vibrational and pure rotational coherent anti-stokes Raman scattering (CARS) in molecular hydrogen

VUV-synchrotron absorption studies of N2 and CO at 900K

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