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Information about Tetraoxygen

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O4 is also a subclass of O-class stars.
The tetraoxygen molecule (O4) was first predicted in 1924 by Gilbert N. Lewis, who proposed it as an explanation for the failure of liquid oxygen to obey Curie's law.[1] Today it seems Lewis was off, but not by far: computer simulations indicate that although there are no stable O4 molecules in liquid oxygen, O2 molecules do tend to associate in pairs with antiparallel spins, forming transient O4 units.[2] True O4 does exist, however, as a stable red solid at pressures above 10 GPa.[3] This phase is known as ε oxygen or red oxygen. Tetraoxygen has also been detected as a short-lived chemical species in mass spectrometry experiments.[4]

Red oxygen

As the pressure of oxygen at room temperature is increased through 10 GPa, it undergoes a dramatic phase transition to a different allotrope. Its volume decreases significantly,[5] and it changes color from blue to deep red.[6] Based on its infrared absorption spectrum, this phase is believed to consist of O4 molecules in a crystal lattice.<ref name="Gorelli" />

Liquid oxygen is already used as a rocket fuel, and it has been speculated that red oxygen could make an even better fuel, because of its higher energy density.[7]

At 96 GPa, oxygen undergoes another phase transition and becomes metallic.<ref name="Akahama" />

Free molecule

Theoretical calculations have predicted the existence of metastable O4 molecules with two different shapes: a "puckered" square like cyclobutane,[8] and a "pinwheel" with three oxygen atoms surrounding a central one.[9]

In 2001, a team at the University of Rome La Sapienza conducted a neutralization-reionization mass spectrometry experiment to investigate the structure of free O4 molecules.<ref name="Cacace" /> Their results did not agree with either of the two proposed molecular structures, but they did agree with a complex between two O2 molecules, one in the ground state and the other in a specific excited state.

See also

References

1. ^ Lewis, Gilbert N. (September 1924). "The Magnetism of Oxygen and the Molecule O2". Journal of the American Chemical Society 46 (9): 2027–2032. DOI:10.1021/ja01674a008. 
2. ^ Oda, Tatsuki; Alfredo Pasquarello (October 2004). "Noncollinear magnetism in liquid oxygen: A first-principles molecular dynamics study". Physical Review B 70 (134402): 1–19. DOI:10.1103/PhysRevB.70.134402. 
3. ^ Gorelli, Federico A.; Lorenzo Ulivi, Mario Santoro, and Roberto Bini (November 1999). "The ε Phase of Solid Oxygen: Evidence of an O4 Molecule Lattice". Physical Review Letters 83 (20): 4093–4096. DOI:10.1103/PhysRevLett.83.4093. 
4. ^ Cacace, Fulvio; Giulia de Petris, and Anna Troiani (October 2001). "Experimental Detection of Tetraoxygen". Angewandte Chemie International Edition 40 (21): 4062–4065. DOI:10.1002/1521-3773(20011105)40:21%3c4062::AID-ANIE4062%3e3.0.CO;2-X. 
5. ^ Akahama, Yuichi; Haruki Kawamura, Daniel Häusermann, Michael Hanfland, and Osamu Shimomura (June 1995). "New High-Pressure Structural Transition of Oxygen at 96 GPa Associated with Metallization in a Molecular Solid". Physical Review Letters 74 (23): 4690–4694. DOI:10.1103/PhysRevLett.74.4690. 
6. ^ Nicol, Malcolm; K. R. Hirsch, and Wilfried B. Holzapfel (December 1979). "Oxygen Phase Equilibria near 298 K". Chemical Physics Letters 68 (1): 49–52. 
7. ^ Ball, Phillip. "New form of oxygen found", Nature News, 16 November 2001. Retrieved on 13 July 2006. 
8. ^ Hernández-Lamoneda, R.; A. Ramírez-Solís (September 2000). "Reactivity and electronic states of O4 along minimum energy paths". Journal of Chemical Physics 113 (10): 4139–4145. DOI:10.1063/1.1288370. 
9. ^ Røeggen, I.; E. Wisløff Nilssen (May 1989). "Prediction of a metastable D3h form of tetra oxygen". Chemical Physics Letters 157 (5): 409–414. 
In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics.
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Gilbert Newton Lewis (October 23, 1875 - March 23, 1946) was a famous American physical chemist known for his 1902 Lewis dot structures, his 1916 paper "The Atom and the Molecule", which is the foundation of modern valence bond theory, developed in coordination with Irving
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Liquid oxygen (also LOx, LOX or Lox in the aerospace, submarine and gas industry) is the liquid form of oxygen. It has a pale blue color and is strongly paramagnetic. Liquid oxygen has a density of 1.141 g/cm³ (1.
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In a paramagnetic material Curie's law relates the magnetization of the material to the applied magnetic field and temperature.



is the resulting magnetisation
is the magnetic field, measured in teslas

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spin is the angular momentum intrinsic to a body, as opposed to orbital angular momentum, which is the motion of its center of mass about an external point.

In classical mechanics, the spin angular momentum
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The pascal (symbol: Pa) is the SI derived unit of pressure or stress (also: Young's modulus and tensile strength). It is a measure of perpendicular force per unit area i.e. equivalent to one newton per square meter or one Joule per cubic meter.
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In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so forth).
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Chemical species[1] are atoms, molecules, molecular fragments, ions, etc., as entities being subjected to a chemical process or to a measurement. Generally, a chemical species can be defined as an ensemble of chemically identical molecular entities that can explore the
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Mass spectrometry (previously called mass spectroscopy ()[1] or informally, "mass-spec" and MS) is an analytical technique used to measure the mass-to-charge ratio of ions.
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phase transition or phase change is the transformation of a thermodynamic system from one phase to another. The distinguishing characteristic of a phase transition is an abrupt change in one or more physical properties, in particular the heat capacity, with a small change in
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Allotropy (Gr. allos, other, and tropos, manner) is a behavior exhibited by certain chemical elements: these elements can exist in two or more different forms, known as allotropes of that element.
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Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. The name means "below red" (from the Latin infra, "below"), red being the color of visible light with the longest wavelength.
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A material's absorption spectrum shows the fraction of incident electromagnetic radiation absorbed by the material over a range of frequencies. An absorption spectrum is, in a sense, the opposite of an emission spectrum.
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Liquid oxygen (also LOx, LOX or Lox in the aerospace, submarine and gas industry) is the liquid form of oxygen. It has a pale blue color and is strongly paramagnetic. Liquid oxygen has a density of 1.141 g/cm³ (1.
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Rocket propellants undergo exothermic chemical reactions which produce hot gas which is used by a rocket for propulsive purposes.

Overview

Rockets create thrust by expeling mass backwards in a high speed jet (see Newton's Third Law ).
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Energy density is the amount of energy stored in a given system or region of space per unit volume, or per unit mass, depending on the context. In some cases it is obvious from context which quantity is most useful: for example, in rocketry, energy per unit mass is the most
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The Macro Expansion Template Attribute Language complements TAL, providing macros which allow the reuse of code across template files. Both were created for Zope but are used in other Python projects as well.
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Metastability is the ability of a non-equilibrium state to persist for some period of time.

Metastability in molecules is the ability of a non-equilibrium chemical state to persist for a long period of time.
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Cyclobutane, C4H8, with a molecular mass of 56.107g/mol, is a four carbon alkane in which all the carbon atoms are arranged cyclically, hence cyclobutane. Cyclobutane is a gas and commercially available as a liquefied gas.
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University of Rome La Sapienza (Italian Università degli Studi di Roma "La Sapienza") is the largest European university and the most ancient of Rome's three public universities [2] . In Italian, Sapienza means "wisdom" or "knowledge".
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complex in chemistry usually is used to describe molecules or ensembles formed by the combination of ligands and metal ions. Originally, a complex implied a reversible association of molecules, atoms, or ions through weak chemical bonds.
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stationary state is an eigenstate of a Hamiltonian, or in other words, a state of definite energy. It is called stationary because the corresponding probability density has no time dependence.
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Excitation is an elevation in energy level above an arbitrary baseline energy state. In physics there is a specific technical definition for energy level which is often associated with an atom being excited to an excited state.
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tetranitrogen (N4). It is an unstable polynitrogen molecule that may be useful in such applications as propellants and explosives due to its ability to release a lot of energy when it breaks apart.
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Gilbert Newton Lewis (October 23, 1875 - March 23, 1946) was a famous American physical chemist known for his 1902 Lewis dot structures, his 1916 paper "The Atom and the Molecule", which is the foundation of modern valence bond theory, developed in coordination with Irving
..... Click the link for more information.
digital object identifier (or DOI) is a permanent identifier given to a document, which is not related to its current location. A typical use of a DOI is to give a scientific paper or article a unique identifying number that can be used by anyone to locate details of the paper, and
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digital object identifier (or DOI) is a permanent identifier given to a document, which is not related to its current location. A typical use of a DOI is to give a scientific paper or article a unique identifying number that can be used by anyone to locate details of the paper, and
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digital object identifier (or DOI) is a permanent identifier given to a document, which is not related to its current location. A typical use of a DOI is to give a scientific paper or article a unique identifying number that can be used by anyone to locate details of the paper, and
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digital object identifier (or DOI) is a permanent identifier given to a document, which is not related to its current location. A typical use of a DOI is to give a scientific paper or article a unique identifying number that can be used by anyone to locate details of the paper, and
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