scholarly journals A New Unidentified Far‐Infrared Band in NGC 7027

2004 ◽  
Vol 609 (1) ◽  
pp. 225-230 ◽  
Author(s):  
Javier R. Goicoechea ◽  
Jose Cernicharo ◽  
Helena Masso ◽  
Maria Luisa Senent
Keyword(s):  
Far Infrared ◽  
Infrared Band ◽  
Ngc 7027

scholarly journals Infrared Spectra of the Ices at ≈4 K and the Interpretation of the v OD(D2O) Bands of Ices II and IX

1978 ◽  
Vol 21 (85) ◽  
pp. 694
Author(s):  
F. E. Bates ◽  
S. M. Jacobs ◽  
J. E. Bertie
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Fermi Resonance ◽  
Chemical Physics ◽  
Vibrational States ◽  
Infrared Band ◽  
Stretching Vibrations ◽  
First Time ◽  
Lattice Modes ◽  
Complete Interpretation

Abstract We have studied the infrared absorption by the OD stretching, v OD(D2O), and D2O rotational, v R(D2O), vibrations of fully deuterated ice II and ice IX at lo K, and the absorption by OD stretching vibrations, v OD (HDO), of HDO molecules isolated in ices Ih, II, and IX at 10 K. Calculations of the frequencies and relative intensities of the zero-wave-vector normal v OD(D2O) vibrations of ices II and IX have allowed the v OD(D2O) absorption to be assigned. Each component of the band is broad, even at 10 K, most probably because of Fermi resonance between the fundamental OD stretching vibrational states and the isoenergetic continuum of high-order overtone and combination states of the lattice modes. This work has yielded the most complete interpretation yet achieved of an infrared band due to the OH or OD stretching vibrations of a phase of ice. The far-infrared absorption by the translational vibrations of H2O and D2O ices Ih and Ic at 4.3 K has been measured, and has revealed differences between the spectra of ices III and Ic for the first time. Papers describing this work in full have been published in Journal of Chemical Physics, Vol. 67, No. 4, 1977, p. 1311-18, and Vol. 67, No. 6, 1977, p. 2445-48.

scholarly journals Determination and model construction of microbes' complex refractive index in far infrared band

2013 ◽  
Vol 62 (9) ◽  
pp. 094218
Author(s):  
Sun Du-Juan ◽  
Hu Yi-Hua ◽  
Gu You-Lin ◽  
Wang Yong ◽  
Li Le
Keyword(s):  
Refractive Index ◽  
Complex Refractive Index ◽  
Far Infrared ◽  
Model Construction ◽  
Infrared Band

Quantitative far-infrared band strengths of iodine monochloride (ICl), a molten salt off-gas product

2020 ◽  
Author(s):  
Kendall D. Hughey ◽  
Ashley Bradley ◽  
Heather M. Felmy ◽  
Andrew J. Clifford ◽  
Richard M. Cox ◽  
...  
Keyword(s):  
Molten Salt ◽  
Far Infrared ◽  
Iodine Monochloride ◽  
Infrared Band

scholarly journals Far-infrared spectroscopy of Planetary Nebulae with the KAO

1997 ◽  
Vol 180 ◽  
pp. 278-278
Author(s):  
R. H. Rubin ◽  
S.W.J. Colgan ◽  
M.R. Haas ◽  
S. D. Lord ◽  
J. P. Simpson
Keyword(s):  
Infrared Spectroscopy ◽  
Ionizing Radiation ◽  
Radiation Field ◽  
Electron Density ◽  
Flux Ratio ◽  
Planetary Nebulae ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Ionic Ratio ◽  
Ngc 7027

We present new far-infrared line observations of the planetary nebulae (PNs) NGC 7027, NGC 7009, NGC 6210, NGC 6543, and IC 4997 obtained with the Kuiper Airborne Observatory (KAO). The bulk of our data are for NGC 7027 and NGC 7009, including [Ne V] 24 μm, [O IV] 26 μm, [O III] (52, 88μm), and [Nm] 57 μm. Our data for [O III] (52, 88) and [N III] 57 in NGC 7027 represent the first measurements of these lines in this source. The large [O III] 52/88 flux ratio implies an electron density (cm–3) of log Ne[O III] = 4.19, the largest Ne ever inferred from these lines. We derive N++/O++ = 0.394±0.062 for NGC 7027 and 0.179±0.043 for NGC 6210. We are able to infer the O+3/O++ ionic ratio from our data. As gauged by this ionic ratio, NGC 7027 is substantially higher ionization than is NGC 7009 – consistent with our observation that the former produces copious [Ne V] emission while the latter does not. These data help characterize the stellar ionizing radiation field.

Far-infrared observations of NGC 7027

1977 ◽  
Vol 211 ◽  
pp. 475 ◽  
Author(s):  
C. M. Telesco ◽  
D. A. Harper
Keyword(s):  
Far Infrared ◽  
Infrared Observations ◽  
Ngc 7027

Far-infrared emission line and continuum observations of NGC 7027

1981 ◽  
Vol 243 ◽  
pp. 170 ◽  
Author(s):  
G. Melnick ◽  
R. W. Russell ◽  
G. E. Gull ◽  
M. Harwit
Keyword(s):  
Emission Line ◽  
Far Infrared ◽  
Infrared Emission ◽  
Ngc 7027

Far-infrared and Raman Spectra of Crystalline ICN

1971 ◽  
Vol 49 (14) ◽  
pp. 2459-2462 ◽  
Author(s):  
R. Savoie ◽  
M. Pézolet
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
High Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Infrared Band ◽  
Longitudinal Modes ◽  
Intensity Measurements ◽  
Cyanogen Iodide ◽  
Far Infrared Spectra

The Raman and far-infrared spectra of crystalline cyanogen iodide have been recorded. High-frequency shoulders alongside the Raman bands confirm the piezoelectric nature of this solid and allow an estimate to be made of the frequencies of the longitudinal modes associated to the fundamental vibrations. Dipole derivatives calculated from these frequencies agree qualitatively with those obtained from infrared band intensity measurements.

scholarly journals Advances in Infrared Observations of Planetary Nebulae

1978 ◽  
Vol 76 ◽  
pp. 103-110 ◽  
Author(s):  
David M Rank
Keyword(s):  
Thermal Emission ◽  
Line Emission ◽  
Planetary Nebulae ◽  
Far Infrared ◽  
Infrared Emission ◽  
Continuum Emission ◽  
Infrared Observations ◽  
Ngc 7027 ◽  
Structure Line ◽  
Middle Infrared

The discovery of infrared continuum emission from NGC 7027 by Gillett, Low, and Stein in 1967 marked the beginning of far infrared observations of planetary nebulae. These early observations verified the predictions (Delmer, Gould, and Ramsey 1967) of infrared fine structure line emission from the SIV ion and also provided a surprise; namely, that the continuum radiation from planetary nebulae was not free-free emission from the gas, but rather that it was thermal emission from heated dust grains. In the ten years which have elapsed since 1967, numerous infrared emission lines have been observed and interpreted in many of the brighter planetary nebulae. In the middle infrared these lines were principally Ne II at 12.8μ, Gillett et al. (1969); SIV at 10.5μ, Holtz, et al. (1971), Gillett, et al. (1972), Aitken and Jones (1973); and AIII at 9.0μ Geballe and Rank (1973) and Gillett and Forrest (1973).

scholarly journals Infrared Spectra of the Ices at ≈4 K and the Interpretation of the vOD(D2O) Bands of Ices II and IX

1978 ◽  
Vol 21 (85) ◽  
pp. 694-694
Author(s):  
F. E. Bates ◽  
S. M. Jacobs ◽  
J. E. Bertie
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Fermi Resonance ◽  
Chemical Physics ◽  
Vibrational States ◽  
Infrared Band ◽  
Stretching Vibrations ◽  
First Time ◽  
Lattice Modes ◽  
Complete Interpretation

AbstractWe have studied the infrared absorption by the OD stretching, vOD(D2O), and D2O rotational, vR(D2O), vibrations of fully deuterated ice II and ice IX at lo K, and the absorption by OD stretching vibrations, vOD (HDO), of HDO molecules isolated in ices Ih, II, and IX at 10 K. Calculations of the frequencies and relative intensities of the zero-wave-vector normal vOD(D2O) vibrations of ices II and IX have allowed the vOD(D2O) absorption to be assigned. Each component of the band is broad, even at 10 K, most probably because of Fermi resonance between the fundamental OD stretching vibrational states and the isoenergetic continuum of high-order overtone and combination states of the lattice modes. This work has yielded the most complete interpretation yet achieved of an infrared band due to the OH or OD stretching vibrations of a phase of ice.The far-infrared absorption by the translational vibrations of H2O and D2O ices Ih and Ic at 4.3 K has been measured, and has revealed differences between the spectra of ices III and Ic for the first time.Papers describing this work in full have been published in Journal of Chemical Physics, Vol. 67, No. 4, 1977, p. 1311-18, and Vol. 67, No. 6, 1977, p. 2445-48.

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