Energy level structure and potential energy curve of the <mml:math altimg="si28.gif" display="inline" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mspace width="0.35em"/><mml:msubsup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math> state of Ne2 by high-resolution VUV laser spectroscopy

The absorption spectrum of the Mg2 molecule, which occurs in a furnace containing Mg vapor, has been photographed with a high resolution spectrograph. The rotational structures of the bands have been analyzed and the rotational and vibrational constants of the two states determined. The bands are found to arise from a 1Σ–1Σ transition between a very lightly bonded ground state and a more stable excited state. The R.K.R. potential energy curve of the ground state, which has a dissociation energy of 399 cm−1, has been determined. The more important constants of the ground state are ωe = 51.12 cm−1, ωexe = 1.64 cm−1, re = 3.890 Å and those of the upper state are ωe = 190.61 cm−1, ωexe = 1.14 cm−1, re = 3.082 Å.

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The B′2Σ+ → X2Σ+ systems of MgH and MgD

Canadian Journal of Physics ◽

10.1139/p76-229 ◽

1976 ◽

Vol 54 (18) ◽

pp. 1898-1904 ◽

Cited By ~ 28

Author(s):

Walter J. Balfour ◽

Hugh M. Cartwright

Keyword(s):

High Resolution ◽

Potential Energy ◽

Dissociation Energy ◽

Potential Energy Curve ◽

Energy Levels ◽

Rotational Energy ◽

Energy Curve ◽

Molecular Constants ◽

Vibrational Levels

The B′2Σ+ → X2Σ+ systems in MgH and MgD have been studied in emission at high resolution. Vibrational and rotational analyses, which have been performed for 37 bands of MgH and 16 bands of MgD, provide data on the following vibrational levels of the B′ state: MgH, ν = 0–9; MgD, ν = 0–2, 4–6. The following molecular constants (in cm−1) have been determined for the B′ state: MgH, Tc = 22 410, ωc = 828.4, ωcxc = 11.8, Bc = 2.585, Dc = 1.2 × 10−4; MgD, Tc = 22 415, ωc = 598.1, ωcxc = 6.4, Bc = 1.346, Dc = 2.6 × 10−5. The dissociation energy, Dc, in the B′ state is estimated to be 10 900 cm−1 (MgH), 11 200 cm−1 (MgD). The RKR potential energy curve for the B′ state has been calculated. A correlation of the rotational perturbations in the B′ → X system with the positions of rotational energy levels in the A2Π and B′2Σ+ states has been made. Observations for the low-lying states of MgH are compared with similar available data for related hydrides.

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Etats de valence de NSe : Mise en évidence d'un état a(4Πi)

Canadian Journal of Physics ◽

10.1139/p76-155 ◽

1976 ◽

Vol 54 (12) ◽

pp. 1292-1308 ◽

Cited By ~ 4

Author(s):

Dominique Daumont ◽

Alain Jenouvrier ◽

Bernard Pascat

Keyword(s):

Energy Level ◽

Potential Energy ◽

Relative Position ◽

Spectral Region ◽

Potential Energy Curve ◽

Energy Curve ◽

Vibrational Assignment ◽

Rotational Constants ◽

Complete Study

The complexity of the spectral region 3500–5500 Å has been noted in an earlier study and is due to the presence of many vibrational and rotational perturbations. New data which have been obtained, in particular from a complete study of the spectrum of 15N80Se, have led us to re-examine thoroughly our interpretation of the 3300–5800 Å region. We have thus arrived at a new vibrational assignment and have found evidence for two perturbing states: the b(4Σ−) state for which a transition to one level has been observed weakly and analyzed; the a (4Πi) state which has been identified and for which we have been able to determine vibrational and rotational constants. The relative position of the six observed states may be accounted for in terms of energy level and potential energy curve diagrams.

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