A discussion on infared astronomy - The emission spectrum of the night airglow from 2 to 4μm

1969 ◽  
Vol 264 (1150) ◽  
pp. 161-161
Keyword(s):  
Infrared Spectrum ◽  
Emission Spectrum ◽  
High Altitude ◽  
Emission Band ◽  
Night Airglow

The infrared spectrum of the airglow in the region 2 to 4 μm has been measured with a two-beam interferometer carried to high altitude by a balloon. The aV= 1 sequence of OH bands is in evidence as well as an emission band of CO 2 .

THE NEAR INFRARED SPECTRUM OF THE NIGHT AIRGLOW OBSERVED FROM HIGH ALTITUDE

1964 ◽  
Vol 42 (6) ◽  
pp. 1037-1045 ◽  
Author(s):  
H. P. Gush ◽  
H. L. Buijs
Keyword(s):  
Infrared Spectrum ◽  
Emission Spectrum ◽  
High Altitude ◽  
Electronic Transition ◽  
Near Infrared ◽  
Michelson Interferometer ◽  
Infrared Emission ◽  
Upper Atmosphere ◽  
Transition Formula ◽  
First Time

The infrared emission spectrum of the upper atmosphere between 1.2 and 2.5 microns has been measured at night by means of a Michelson interferometer carried to an altitude of 90,000 feet by a balloon. The complete Δν = 2 sequence of rotation–vibration OH bands has been observed at a resolution sufficient to resolve the rotational structure. The (0, 0) band of the electronic transition [Formula: see text] of oxygen at 1.27 microns has been observed in the night-sky spectrum for the first time. Its brightness is comparable with that of the (4, 2) OH band at 1.6 microns.

The electronic emission spectrum of triatomic hydrogen. I. Parallel bands of H3 and D3 near 5600 and 6025 Å

1980 ◽  
Vol 58 (8) ◽  
pp. 1238-1249 ◽  
Author(s):  
I. Dabrowski ◽  
G. Herzberg
Keyword(s):  
Interstellar Medium ◽  
Emission Spectrum ◽  
Detailed Analysis ◽  
Ground State ◽  
Emission Band ◽  
Rydberg States ◽  
Electronic States ◽  
Molecular Constants ◽  
Additional Band ◽  
Rydberg Electron

A spectrum of triatomic hydrogen and deuterium was first discovered by means of an emission band with diffuse rotational structure near 5600 Å. An additional band of similar but much better resolved structure was subsequently observed near 6025 Å. The detailed analysis of these two bands for both H3 and D3 is described in this paper. Both bands are [Formula: see text] bands of a symmetric top; their structure establishes beyond doubt that triatomic hydrogen has a D3h structure in its Rydberg states. The molecular constants in upper and lower states are close to those in the ground state of H3+ (or D3+) in accordance with the assumption that these states are Rydberg states in which a single electron moves around a H3+ or D3+ core. The predicted states of such a Rydberg electron in a field of D3h symmetry account very well for the observed electronic states, both those involved in the [Formula: see text] bands described here and those involved in the [Formula: see text] bands to be discussed in subsequent papers of this series. The lowest state of the Rydberg electron 2p2E′ is unstable and dissociates to H2 + H in their ground states. It is this state that causes predissociation in the two lower states 2s2A1′and 2p2A2″ of the two [Formula: see text] bands here under discussion. The predissociation of 2s2A1′ is vibronically allowed and fairly strong such that all lines have widths of about 7 cm−1 for D3 and 30 cm−1 for H3. The predissociation of the 2p2A2″ state is vibronically forbidden and occurs only on account of ro-vibronic interaction. H3+ ions are assumed to be present in the interstellar medium. When they recombine with electrons they must necessarily emit the spectra described in this series of papers.

THE VISIBLE EMISSION SPECTRUM OF Cl2+1

1958 ◽  
Vol 36 (11) ◽  
pp. 1557-1568 ◽  
Author(s):  
V. Venkateswara Rao ◽  
P. Tiruvenganna Rao
Keyword(s):  
Potential Energy ◽  
Emission Spectrum ◽  
Normal State ◽  
Emission Band ◽  
Visible Emission ◽  
Lower State ◽  
Vibrational Assignments ◽  
Two Systems ◽  
Visible Emission Band ◽  
Concave Grating

Two visible emission band systems attributed to the ionized molecule Cl2+ were studied using the second order of a 21-ft concave grating spectrograph (dispersion 1.25 Å/mm). Rotational analyses have been carried out for six bands of system I and six of system III for which new vibrational analyses have recently been proposed by Haranath and Rao. The rotational analyses of the bands of these two systems are consistent with the vibrational assignments. Rotational constants for the upper and lower states of the two systems have been derived. Both the vibrational and rotational analyses of systems I and III indicate case (c) 1/2–1/2 and 3/2–3/2 transitions respectively for the two systems. Potential energy curves are drawn for the upper and the lower states of each of the two systems. The lower states dissociate into a normal Cl (2P) + Cl+(3P) while the upper states dissociate into a normal Cl (2P) + an excited Cl+ (1D). It is suggested that the lower state of system 111 is probably the normal state of Cl2+ from theoretical and experimental evidence.

The measurement and extraction of the Nu<sub>6</sub> atmospheric emission band of CFC-12 from interfering emission features

1995 ◽  
Vol 13 (9) ◽  
pp. 969-972
Author(s):  
W. F. J. Evans ◽  
E. Puckrin
Keyword(s):  
Emission Spectrum ◽  
Greenhouse Gas ◽  
Emission Band ◽  
Thermal Emission ◽  
Radiative Flux ◽  
Atmospheric Emission ◽  
Good Agreement

Abstract. Ground-based thermal emission measurements of the zenith sky have been made at Peterborough, Ontario since January 1993. In this paper, the measurement of the Nu6 band of atmospheric CFC-12, an important greenhouse gas, is presented for a cold, clear day in January 1994. A spectrum of the non-CFC-12 emission features has been simulated using the FASCD3P radiation code and measured radiosonde profiles of temperature, pressure and humidity. This has enabled a satisfactory subtraction of the interfering emission features from the CFC-12 emission spectrum. A comparison of the observed and simulated Nu6-bands of CFC-12 shows good agreement at all frequencies of emission. From these spectra the total downward greenhouse radiative flux from the CFC-12 Nu6 emission based for a very cold day has been estimated to be 0.27 W m–2±10%.

EMISSION BAND SPECTRA OF NITROGEN THE LYMAN-BIRGE-HOPFIELD SYSTEM

1956 ◽  
Vol 34 (8) ◽  
pp. 780-789 ◽  
Author(s):  
Alf Lofthus
Keyword(s):  
Raman Spectrum ◽  
High Resolution ◽  
Emission Spectrum ◽  
Ground State ◽  
Emission Band ◽  
Equilibrium Constants ◽  
Rotational Constants ◽  
Near Ultraviolet ◽  
Band Spectra

The near ultraviolet part of the emission spectrum of nitrogen has been photographed under high resolution. Thirteen bands of the [Formula: see text] system (Lyman–Birge–Hopfield) have been analyzed and new vibrational and rotational constants obtained. Combining the observed data with those obtained by Stoicheff from the Raman spectrum of nitrogen, refined equilibrium constants for the ground state were obtained. The predissociation in the α1Πg state was observed.

scholarly journals Discovery of a TiO emission band in the infrared spectrum of the S star NP Aurigae

2012 ◽  
Vol 543 ◽  
pp. L2 ◽  
Author(s):  
K. Smolders ◽  
T. Verhoelst ◽  
P. Neyskens ◽  
J. A. D. L. Blommaert ◽  
L. Decin ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Emission Band

OBSERVATION OF THE TRANSITION IN O2

1961 ◽  
Vol 39 (8) ◽  
pp. 1110-1119 ◽  
Author(s):  
J. F. Noxon
Keyword(s):  
Emission Spectrum ◽  
High Altitude ◽  
Transition Probability ◽  
Electric Quadrupole ◽  
The Absolute ◽  
Absolute Transition ◽  
Absolute Transition Probability

The Q branch of the (0,0) band of the electric quadrupole [Formula: see text] transition in O2 has been observed at 1.908 μ in the emission spectrum of a discharge through O2 and He. By a comparison with the (0,0) atmospheric O2 band [Formula: see text], the absolute transition probability for the (b–a) system has been found to be 2.5 × 10−3 sec−1, with an uncertainty of a factor of 2. The (0,0) band of the infrared atmospheric [Formula: see text] system of O2 has also been observed in emission. Using the observed intensity of the (0,1) atmospheric O2 band in the aurora and airglow one may predict that the (0,0) (b–a) band should be detectable in a strong aurora if observations are made from high altitude.

Influence on Afterglow Spectra due to Different Phases of Zn3(PO4)2: Mn2+

2013 ◽  
Vol 423-426 ◽  
pp. 415-418
Author(s):  
Zi Ran Liu ◽  
Rui Xia Zhong ◽  
Hui Zhao ◽  
Xiao Yan Zhang
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Emission Spectrum ◽  
Emission Band ◽  
Doping Concentration ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Green Fluorescence ◽  
Α Phase ◽  
Wide Emission Band

High temperature solid state reaction has been used to prepare Zn3(PO4)2: Mn2+. XRD analysis shows that different phases have been generated with different Mn2+ doping concentration at the same sintering temperature. Low Mn2+ doping concentration is conducive to form α phase, while γ is in favor of high Mn2+ doping concentration. In α phase, the emission spectrum of Mn2+ is a wide emission band peaking at 542 nm, green fluorescence. In γ phase, the emission spectrum of Mn2+ is a wide emission band peaking at 608 nm, red fluorescence. In the both phases, green and red afterglows have been observed. The red afterglow in γ phase has stronger initial brightness and longer afterglow decay time than the green afterglow in α phase, the reason of which lies in the larger trap concentration in γ phase.

THE EMISSION SPECTRUM OF THE CCI RADICAL

1961 ◽  
Vol 39 (2) ◽  
pp. 252-262 ◽  
Author(s):  
R. D. Gordon ◽  
G. W. King
Keyword(s):  
Emission Spectrum ◽  
Emission Band ◽  
Microwave Discharge ◽  
Vibrational Analysis ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Combining States

A rotational analysis of the 2780 Å emission band obtained in a microwave discharge through CCl4 vapor and photographed on a 20-ft grating spectrograph shows that a 2Δi(b) → 2Πr(a) transition of the CCl radical is responsible, not 2Σ → 2Π(a) as reported by previous workers. Molecular constants are given for the combining states, as well as a vibrational analysis that identifies the 2780 Å band as the (0–0) band.

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