α‐Oxygen doublets. I. Theory

Gaididei, Yuri; Локтев, В. М.; Prikhotko, A. F.; Shanskii, L. I.

doi:10.1002/pssb.2220720241

Cited by 20 publications

(25 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) are well described by ( 5 ) ) if the band width of the exciton is taken equal to 20 to 24 cm-l, which agrees with the value obtained before [7]. I n particular, it follows from [7] that the X exciton has a positive effective mass and so we have…”

Section: Biezciton Doubletssupporting

confidence: 87%

See 1 more Smart Citation

α‐Oxygen Doublets II. Experiment

Gaididei

Локтев

Prikhotko

et al. 1976

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

Yu. B. GAIDIDEI et al.: a-Oxygen Doublets (11) 415 phys. stat. sol. (b) 73, 415 (1976) Subject classification: 13.5.1 and 20.1; 23 Institute of Theoretical Physics ( a ) and Institute of Physics (b), Academy of Sciencea of the Ukrainian SSR, Kiev a-Oxygen Doublets 11. Experiment BY Yu. B. GAIDIDEI (a), V. M. LOKTEV (a), A. F. PRIKHOTKO (b), and L. I. SRANSKII (b)Experimental results of two-exciton light absorption in a-0, at T = 1 K are presented.On the basis of a theory which was previously developed, the interpretation of the doublet structure of the observed absorption is proposed. The effect of resonance interaction on the formation of the vibronic bimolecular bands and the importance of the excited collective states are discussed..Es werden experimentelle Ergebnisse zur Zwei-Exzitonen-Lichtabsorption in a-0, bei T = 1 K mitgeteilt. Auf der Grundlage einer friiher entwickelten Theorie wird eine Interpretation der Dublett-Struktur der beobachteten Absorption vogeschlagen. Der EinfluB von Resonanz-Wechselwirkung auf die Herausbildung der bimolekularen Schwingungs-Banden und die Bedeutung von angeregten kollektiven Zustiinden werden diskutiert.

show abstract

Section: Biezciton Doubletssupporting

confidence: 87%

“…It is well known that transparent y-0, cracks and transforms into "a-0, ice", which strongly scatters light passing through a crystal. This difficulty is of no importance for determining the line frequency, but is essential for absorption coefficient measurements [7].…”

Section: Some Methodical Remarksmentioning

confidence: 99%

α‐Oxygen Doublets II. Experiment

Gaididei

Локтев

Prikhotko

et al. 1976

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

show abstract

“…[16]; just decreases the intensity with the same shape. It is supposed that the observed shape deformation in the RS (0-1) of liquid oxygen originates from the orbital Zeeman effect [16][17][18][19]. The orbital Zeeman splitting was reported only in the α-phase of solid oxygen RS (0-1) and (0-2) where the zero phonon line is as sharp as 3 meV [17].…”

Section: Resultsmentioning

confidence: 99%

“…The first is the decrease of the intensity, which can be explained by the decrease of the number of singlet dimers in the ground state [3]. The second is the peak splitting; fine structures of the absorption spectrum of α-oxygen linearly split to 3 peaks by the magnetic field [16][17][18][19]. The peak splitting is supposed to originate from the orbital Zeeman splitting of the excited state ( 1 ∆ g 1 ∆ g , S T = 0) in the bimolecular absorption.…”

Section: Introductionmentioning

confidence: 99%

Orbital Zeeman Effect of Liquid Oxygen in High Magnetic Fields

Nomura

Matsuda

Takeyama

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

View full text Add to dashboard Cite

Liquid oxygen is a magnetic fluid which shows anomalous properties due to the spin quantum number S = 1 of the molecular oxygen O 2 . Bimolecular absorption, which is the origin of the blue color in condensed oxygen, is a distinctive feature of the magnetic interaction. In this study, the magnetic field dependence of the bimolecular absorption is investigated. By applying the magnetic field, a deformation of the spectrum shape along with a reduction of the intensity is observed. The orbital Zeeman effect, which releases the degeneracy of the excited state, can explain the change of the spectrum width. To explain the smaller energy splitting comparing to the theoretical value, the effect of the randomly oriented molecules is taken into account. For a quantitative understanding of the orbital Zeeman effect of liquid oxygen, more detailed analyses will be required.

show abstract

“…This affects the bimolecular absorption; bimolecular absorption cannot occur when there are no AFM O 2 pairs [13,[16][17][18][19][20]. Therefore, in addition to the magnetization jump, the significant suppression of the bimolecular absorption shown in Fig.…”

Section: Prl 112 247201 (2014) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

A New Phase of Solid Oxygen

Kitagawa¹

2014

Physics

View full text Add to dashboard Cite

Magnetization measurements and magnetotransmission spectroscopy of the solid oxygen α phase were performed in ultrahigh magnetic fields of up to 193 T. An abrupt increase in magnetization with large hysteresis was observed when pulsed magnetic fields greater than 120 T were applied. Moreover, the transmission of light significantly increased in the visible range. These experimental findings indicate that a first-order phase transition occurs in solid oxygen in ultrahigh magnetic fields, and that it is not just a magnetic transition. Considering the molecular rearrangement mechanism found in the O 2 -O 2 dimer system, we conclude that the observed field-induced transition is caused by the antiferromagnetic phase collapsing and a change in the crystal structure. Since Faraday discovered that molecular oxygen is paramagnetic in 1850, oxygen has attracted significant interest as a ubiquitous but exotic molecular magnet [1]. The paramagnetism of gaseous oxygen arises from the spin quantum number S ¼ 1 of O 2 . In condensed oxygen, the exchange interaction between O 2 molecules develops and contributes to the cohesive energy in addition to the van der Waals force. Particularly in solid oxygen, the magnetic contribution to the condensation energy is non-negligible and affects the resultant crystal structure through spinlattice coupling.At atmospheric pressure, solid oxygen has three phases with different magnetic and crystal structures [2]. Hightemperature γ oxygen (54.4-43.8 K) is a paramagnetic phase where orientationally disordered molecules form an A15 cubic structure. The γ-β transition occurs at 43.8 K because of the ordering of the molecular axis parallel to the c axis, and the short-range antiferromagnetic (AFM) correlation develops. At the transition, the crystal symmetry changes from cubic to rhombohedral, accompanied by a large volume contraction. As the temperature is reduced further, the β-α transition occurs at 23.9 K, because of long range AFM ordering where the crystal transforms from rhombohedral to monoclinic. Because of the strong spinlattice coupling, solid oxygen is regarded as a spincontrolled crystal [3].Since magnetic energy affects the packing structure of solid oxygen, external magnetic fields may alter the crystal structure through magnetization. Previously, magnetization measurements of the solid oxygen α phase have been performed up to 50 T [4]. However, at these field strengths, the magnetization curve is almost linear and no phase transition is observed. Subsequently, no higher field experiments were performed on solid oxygen because of technical difficulties of conducting experiments in ultrahigh magnetic fields. Therefore, little is known about the effect of magnetic fields on the phase diagram of solid oxygen.From a theoretical point of view, the effect of magnetic fields on solid oxygen is intriguing. Ab initio calculations of an O 2 -O 2 dimer predict the spatial rearrangement of the O 2 molecules depending on the magnetization [5][6][7]. The two O 2 molecules normally couple in a pa...

show abstract

α‐Oxygen doublets. I. Theory

Cited by 20 publications

References 13 publications

α‐Oxygen Doublets II. Experiment

α‐Oxygen Doublets II. Experiment

Orbital Zeeman Effect of Liquid Oxygen in High Magnetic Fields

A New Phase of Solid Oxygen

Contact Info

Product

Resources

About