Measurement of rovibrational ΔJ = 0, 4, and 6 transitions in solid H2 together with their associated pair spectra

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1122-1136 ◽  
Author(s):  
Ronald A. Steinhoff ◽  
K. V. S. R. Apparao ◽  
David W. Ferguson ◽  
K. Narahari Rao ◽  
Brenda P. Winnewisser ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Fourier Transform Spectrometer ◽  
Para Hydrogen ◽  
Absorption Path Length ◽  
Hydrogen Impurity ◽  
Absorption Path ◽  
Intensity Parameters ◽  
Path Lengths ◽  
Associated Pair ◽  
Line Positions

Weak features in the infrared spectum of solid para-hydrogen containing a small amount of orth-hydrogen impurity were measured with high resolution (0.01–0.036 cm−1) and high sensitivity using a Fourier transform spectrometer. Effective absorption path lengths in the solid of 3.75 cm (for the range 4 000–10 000 cm−1) and 15.0 cm (for the range 5000–8000 cm−1) were used to observe the discrete zero-phonon rovibrational transitions U1←0(0), U1←0(1), and W1←0(0), for which accurate line positions and intensity parameters are given. Line positions for the associated satellite spectra for each of those transitions and for the Q1←0(0) and Q1←0(1) transitions were also determined. New features in the satellite spectra of the Q1←0(0), Q1←0(1), U1←0(0), and U1←0(1) transitions are reported. A novel ortho-hydrogen to para-hydrogen converter allowed convenient variation of the temperature for conversion. A multipass optical system external to the head of the cryostat was designed to extend the absorption path length through the hydrogen crystal.

Overtone spectra of parahydrogen and orthodeuterium in the liquid phase

2000 ◽  
Vol 78 (4) ◽  
pp. 317-325 ◽  
Author(s):  
M Mengel ◽  
B P Winnewisser ◽  
M Winnewisser
Keyword(s):  
Fourier Transform ◽  
Liquid Phase ◽  
Solid Phase ◽  
Fourier Transform Spectrometer ◽  
Mid Infrared ◽  
Intensity Parameters ◽  
Absorption Features

We report the results of our observations of liquid parahydrogen in the mid-infrared and of liquid parahydrogen and orthodeuterium in their first and second overtone regions using a Bruker IFS 120 HR Fourier transform spectrometer. We have determined intensity parameters for individual absorption features where possible and indicate analogies between the spectrum of the liquid and the corresponding spectrum of the solid phase of the hydrogens. PACS Nos.: 33.20Ea, 33.70Fd, 67.90+z

scholarly journals High sensitivity static Fourier transform spectrometer

2021 ◽  
Author(s):  
Fabio Frassetto ◽  
Lorenzo Cocola ◽  
Paola Zuppella ◽  
Vania Da Deppo ◽  
Luca Poletto
Keyword(s):  
Fourier Transform ◽  
High Sensitivity ◽  
Fourier Transform Spectrometer

H218O: line positions and intensities between 9500 and 11 500 cm−1. The (041), (220), (121), (300), (201), (102), and (003) interacting states

1987 ◽  
Vol 65 (7) ◽  
pp. 777-789 ◽  
Author(s):  
J. -P. Chevillard ◽  
J. -Y. Mandin ◽  
J.-M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Fourier Transform ◽  
Water Vapor ◽  
Energy Levels ◽  
Rotational Energy ◽  
Fourier Transform Spectrometer ◽  
Vibrational States ◽  
Line Intensities ◽  
Line Positions ◽  
Average Uncertainty

The spectrum of 18O-enriched water vapor has been recorded between 9500 and 11 500 cm−1, with the aid of a Fourier-transform spectrometer. Its analysis has allowed the determination of 419 accurate rotational energy levels belonging to seven interacting vibrational states of H218O: (041), (220), (121), (300), (201), (102), and (003). Moreover, 622 line intensities belonging to the 4ν2 + ν3, 2ν1 + 2ν2, ν1 + 2ν2 + ν3, 3ν1, 2ν1 + ν3, ν1 + 2ν3, and 3ν3 bands have been measured with an average uncertainty of 6%.

scholarly journals A High-Sensitivity Fourier Transform Spectrometer for Cosmic Microwave Background Observations

2020 ◽  
Vol 69 (7) ◽  
pp. 4516-4523 ◽  
Author(s):  
Javier De Miguel-Hernandez ◽  
Roger J. Hoyland ◽  
Maria F. Gomez Renasco ◽  
Jose Alberto Rubino-Martin ◽  
Teodora A. Viera-Curbelo
Keyword(s):  
Fourier Transform ◽  
Cosmic Microwave Background ◽  
High Sensitivity ◽  
Fourier Transform Spectrometer ◽  
Microwave Background

H218O: The (030), (110), and (011) interacting states. Line positions and intensities for the 3ν2, ν1 + ν2, and ν2 + ν3 bands

1985 ◽  
Vol 63 (8) ◽  
pp. 1112-1127 ◽  
Author(s):  
J.-P. Chevillard ◽  
J.-Y. Mandin ◽  
J.-M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Vibrational State ◽  
Energy Levels ◽  
Fourier Transform Spectrometer ◽  
Vibrational States ◽  
Line Intensities ◽  
Moment Operator ◽  
Line Positions ◽  
Fermi Type ◽  
Effective Constants

The spectrum of oxygen-18 enriched water vapor was recorded between 4400 and 6100 cm−1 with the aid of a Fourier transform spectrometer. Its analysis allowed the determination of 60 energy levels of the (030) vibrational state of H218O and improvements in the knowledge of the energy levels belonging to the (110) and (011) vibrational states of this molecule. A fit of 330 rotational levels of the (030), (110), and (011) states was performed using 54 effective constants and taking into account the Coriolis-type and Fermi-type interactions. Moreover, 853 line intensities belonging to the 3ν2, ν1 + ν2, and ν2 + ν3 bands were measured. The constants involved in the rotational expansion of the transformed transition moment operator corresponding to these bands were determined through a fit of these line intensities. The constants obtained were then used to compute the whole spectrum of the 3ν2, ν1 + ν2, and ν2 + ν3 bands of H218O. This spectrum should be of interest for atmospheric studies.

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