High resolution emission spectrum of H2 between 78 and 118 nm

1984 ◽  
Vol 62 (12) ◽  
pp. 1686-1705 ◽  
Author(s):  
Jean-Yves Roncin ◽  
Françoise Launay ◽  
Michel Larzilliere
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Appreciable Amount ◽  
Molecular Constants ◽  
Strong Emission ◽  
Reported Data ◽  
Quantum Defect Theory ◽  
First Time ◽  
Line Positions ◽  
Absorption Features

The complete high resolution emission spectrum of molecular hydrogen is obtained for the first time in the range 78–118 nm. A uniform set of data is derived from accurate line positions of the (unperturbed) Q branches of the C, D, D′, and [Formula: see text] transitions. Molecular constants fitted for both the ground state and the excited states of symmetry [Formula: see text] are obtained. For the latter case, they are compared with ab initio and multichannel quantum defect theory (MQDT) calculations. Self-absorption features indicate the production, in an appreciable amount, of H2(ν″ = 1) in the discharge. The reported data were not available to laser physicists and also astrophysicists who have observed strong emission lines of H2 from the atmospheres of Jupiter and Saturn.

The Ground State and A2Π Excited State of Magnesium Deuteride

1975 ◽  
Vol 53 (15) ◽  
pp. 1477-1482 ◽  
Author(s):  
Walter J. Balfour ◽  
Hugh M. Cartwright
Keyword(s):  
Excited State ◽  
High Resolution ◽  
Emission Spectrum ◽  
Isotope Effect ◽  
Ground State ◽  
Visible Emission ◽  
Molecular Constants ◽  
Dissociation Energies ◽  
First Time ◽  
Π State

The visible emission spectrum of MgD has been reexamined at high resolution. Published analyses of the A2Π → X2Σ+ system have been extended and the data have been combined with observations in the B′2Σ+ → X2Σ+ system to provide information on the ground state levels ν = 3, 4, 5, and 6 for the first time. The following molecular constants (in cm−1) have been determined—for the A2Π state: ωc = 1154.75, ωcxc = 16.675, Bc = 3.2190, Dc = 9.64 × 10−5 and for the X2Σ+ state: ωc = 1077.71, ωcxc = 15.92, Bc = 3.0306, and Dc = 9.39 × 10−5. The dissociation energies in the A2Π and X2Σ+ states have been estimated to be ~ 15 500 cm−1 and ~ 11 500 cm−1 respectively. The MgH/MgD isotope effect and the Λ doubling in the A2Π state are discussed.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

The magnetic dipole a1Δg → X3Σg− transition in the oxygen afterglow

1981 ◽  
Vol 59 (10) ◽  
pp. 1391-1398 ◽  
Author(s):  
C. Amiot ◽  
J. Verges
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Magnetic Dipole ◽  
Molecular Constants ◽  
First Time ◽  
Microwave Data

The magnetic dipole a1Δ →X3Σg− transition has been observed for the first time during the recombination of 16O atoms in an afterglow. The spectrum of the 0–0 band has been recorded with a high resolution Fourier transform interferometer. Accurate molecular constants, obtained by combining ir and microwave data, are given for the a1Δg and X3Σg− (ν = 0) electronic levels.

The B′ 1Σu+ → X 1Σg+ and D 1Πu → X 1Σg+ band systems of molecular hydrogen

1994 ◽  
Vol 72 (11-12) ◽  
pp. 856-865 ◽  
Author(s):  
Hervé Abgrall ◽  
Evelyne Roueff ◽  
Françoise Launay ◽  
Jean-Yves Roncin
Keyword(s):  
Excited State ◽  
Spectral Line ◽  
Electric Discharge ◽  
Molecular Hydrogen ◽  
Low Pressure ◽  
Schrödinger Equations ◽  
Molecular Constants ◽  
Electronic Excited State ◽  
First Time ◽  
Line Positions

Spectral line positions and emission probabilities of the B′ 1Σu+ → X 1Σg+ and D 1Πu → X 1Σg+ band systems of molecular hydrogen have been calculated by solving a system of four coupled Schrödinger equations. A great number of rotational lines, emitted by a low-pressure electric discharge in H2, have been identified from 122 nm down to 78 nm. All the 69 bands of the B′ 1Σu+ → X 1Σg+ system and many high-J lines of 145 bands of the D 1Πu → X 1Σg+ system are reported for the first time. Improved molecular constants are derived for the (unperturbed) electronic excited state D 1Πu−.

THE ELECTRONIC EMISSION SPECTRUM AND MOLECULAR CONSTANTS OF IODINE MONOFLUORIDE

1966 ◽  
Vol 44 (2) ◽  
pp. 337-352 ◽  
Author(s):  
R. A. Durie
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Dissociation Energy ◽  
Band System ◽  
Vibrational Analysis ◽  
Rotational Structure ◽  
Molecular Constants ◽  
Present Evidence ◽  
Halogen Compounds ◽  
Concave Grating

Observation by the author (Durie 1951) of a well-developed band system in the emission from an iodine–fluorine flame provided the first evidence for the existence of iodine monofluoride (IF), the last of the six possible diatomic inter-halogen compounds to be detected. The spectrum, which lies in the region 4 300 to 7 600 Å, has since been photographed under high resolution using a 21-ft concave grating spectrograph. The rotational structure of the bands is shown to be consistent with an A3Π0+ → X1Σ transition in the IF molecule. A rotational and vibrational analysis of the bands has been carried out and the molecular constants evaluated for IF. The results are as follows:[Formula: see text]The present evidence relating to the value of the dissociation energy of IF is discussed.

A comprehensive re-analysis of the O 2 (B 3 Ʃ – u – X 3 Ʃ – g ) Schumann-Runge band system

1975 ◽  
Vol 341 (1627) ◽  
pp. 517-536 ◽  
Keyword(s):  
Emission Spectrum ◽  
Band System ◽  
Critical Assessment ◽  
Emission Lines ◽  
Molecular Constants ◽  
Self Consistent ◽  
Computer Based ◽  
First Time

The emission spectrum of O 2 has been excited, recorded and measured between 2116 and 5663 Å. Of the 7700 emission lines which were measured, 5400 have been assigned to 87 bands of the B 3 Ʃ – u — X 3 Ʃ – g Schumann-Runge system of O 2 . Many of these are reported for the first time. A computer-based Loomis-Wood method has been used to assign all of these measurements to unambiguous transitions from which a self-consistent set of molecular constants has been derived. Molecular constants for the b 1 Ʃ + g – X 3 Ʃ – g atmospheric red system of O 2 have been recalculated. A critical assessment has been made of the molecular constants derived from all previous analyses of the Schumann-Runge system.

scholarly journals Колебательно-вращательный анализ "горячей" полосы 2ν_2-ν-=SUB=-2-=/SUB=- молекул -=SUP=-15-=/SUP=-NH-=SUB=-2-=/SUB=-D и -=SUP=-15-=/SUP=-NHD-=SUB=-2-=/SUB=-

2020 ◽  
Vol 128 (1) ◽  
pp. 34
Author(s):  
А.Л. Фомченко ◽  
А.С. Белова ◽  
А.В. Кузнецов
Keyword(s):  
High Resolution ◽  
Initial Data ◽  
Ground State ◽  
Vibrational State ◽  
Energy Levels ◽  
The State ◽  
Energy Structure ◽  
Spectroscopic Parameters ◽  
First Time ◽  
Line Positions

The high-resolution spectra of the “hot” 2ν2-ν2 band of the 15NH2D and 15NHD2 molecules were studied for the first time. The analysis is based on the ground state combination differences method. As a result, the energy structure of the inversion-vibrational state (v2 = 2, s) was obtained for both studied molecules; more than 480 vibrational-rotational transitions of the “hot” bands were assign. The values ​​of the upper energy levels determined on the basis of the line positions were used as initial data to determine the spectroscopic parameters of the state (v2 = 2, s).

scholarly journals High Resolution Observations of Molecular Gas in the Outflow of M 82

2004 ◽  
Vol 217 ◽  
pp. 314-315
Author(s):  
Fabian Walter ◽  
Axel Weiss ◽  
Nick Scoville
Keyword(s):  
High Resolution ◽  
Mechanical Energy ◽  
Opening Angle ◽  
Molecular Gas ◽  
Molecular Outflow ◽  
Outflow Velocity ◽  
Line Splitting ◽  
Total Mechanical Energy ◽  
First Time ◽  
Absorption Features

We present a high-resolution (3.6“, 70 pc) CO(1-0) mosaic of the molecular gas in M 82 covering an area of 2.5'x3.5’ (2.8 kpc x 3.9 kpc) obtained with the OVRO millimeter interferometer. The observations reveal the presence of huge amounts of molecular gas (> 70% of the total molecular mass, Mtot ≈ 1.3 × 109M⊙) outside the central 1 kpc disk. Molecular streamers are detected in and below M 82's disk out to distances from the center of ~1.7 kpc. Some of these streamers are well correlated with optical absorption features; they form the basis of some of the prominent tidal HI features around M 82. This provides evidence that the molecular gas within M 82's optical disk is disrupted by the interaction with M 81. Molecular gas is found in M 82's outflow/halo, reaching distances up to 1.2 kpc below the plane; CO line-splitting has been detected for the first time in the outflow. The maximum outflow velocity is ~ 230 km s−1; we derive an opening angle of ~ 55° for the molecular outflow cone. The total amount of gas in the outflow is > 3 × 108 M⊙ and its kinetic energy is of order 1055 erg, about one percent of the estimated total mechanical energy input of M 82's starburst. Our study implies that extreme starburst environments can move significant amounts of molecular gas in to a galaxy's halo (and even to the intergalactic medium).

scholarly journals XMM–Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability

2020 ◽  
Vol 492 (4) ◽  
pp. 4646-4665 ◽  
Author(s):  
C Pinto ◽  
D J Walton ◽  
E Kara ◽  
M L Parker ◽  
R Soria ◽  
...  
Keyword(s):  
Accretion Rate ◽  
Compact Object ◽  
Accretion Disc ◽  
Emission Lines ◽  
Time Variability ◽  
Strong Emission ◽  
X Ray ◽  
First Time ◽  
Eddington Limit ◽  
Absorption Features

ABSTRACT Most ultraluminous X-ray sources (ULXs) are thought to be powered by neutron stars and black holes accreting beyond the Eddington limit. If the compact object is a black hole or a neutron star with a magnetic field ≲1012 G, the accretion disc is expected to thicken and launch powerful winds driven by radiation pressure. Evidence of such winds has been found in ULXs through the high-resolution spectrometers onboardXMM–Newton, but several unknowns remain, such as the geometry and launching mechanism of these winds. In order to better understand ULX winds and their link to the accretion regime, we have undertaken a major campaign with XMM–Newton to study the ULX NGC 1313 X-1, which is known to exhibit strong emission and absorption features from a mildly relativistic wind. The new observations show clear changes in the wind with a significantly weakened fast component (0.2c) and the rise of a new wind phase which is cooler and slower (0.06–0.08c). We also detect for the first time variability in the emission lines which indicates an origin within the accretion disc or in the wind. We describe the variability of the wind in the framework of variable super-Eddington accretion rate and discuss a possible geometry for the accretion disc.

Rotational analysis of the B2Σ+ – A2Πi system of the 12C16O+ molecule

1987 ◽  
Vol 65 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Z. Jakubek ◽  
R. Kepa ◽  
A. Para ◽  
M. Rytel
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Least Squares Method ◽  
Nonlinear Least Squares ◽  
Spin Rotation ◽  
Spin Orbit ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Nonlinear Least Squares Method ◽  
First Time

The three bands (0–0, 1–0, 0–1) of the B2Σ+ – A2Πi system of the 12C16O+ molecule have been photographed at high resolution. In total, 824 lines were measured, from which 608 were fitted by a nonlinear least squares method to determine 33 molecular constants. The band-by-band results were merged to obtain 23 molecular constants for the B2Σ+, ν = 0 and 1, and A2Πi, ν = 0 and 1, states. The Λ-doubling constants and spin-orbit constants in the A2Πi, ν = 1 state and spin-rotation constants in the B2Σ+, ν = 0 and 1 states were obtained for the first time, and other constants were defined more precisely.

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