Results 151 to 160 of about 1,079,430 (204)

Polyatomic Molecules

2010
With an increasing number of atoms in a molecule, the complexity of the molecular structure and the many possibilities for different isomeric configurations of these atoms make investigations of polyatomic molecules a challenging task.
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Directed Valence in Polyatomic Molecules

Physical Review, 1931
The interactions of atoms in polyatomic molecules are described qualitatively. Particular attention is paid to atoms of the types of F, O, N, C, where the valences come from $p$ electrons. Directional effects are discussed, namely that the two valences of O, and the three of N, tend to be mutually at right angles, and the four of C have tetrahedral ...
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EPR Breakup of Polyatomic Molecules

The Journal of Physical Chemistry A, 2006
We explore the EPR experiment in the case of the breakup of a polyatomic molecule into two mutually entangled fragments. We give a derivation based on the properties of the dissociated wave function that no information is transferred, not even at a speed smaller than the speed of light, from one entangled partner to the other concerning its measurement
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Rotation of the Polyatomic Molecule

2020
The rotational spectroscopy of the polyatomic molecule is reviewed. The determination of the rotational constants for the different types of rotors is discussed. The rovibrational correction and the electronic correction to the rotational constants are also described. Finally, the experimental methods are briefly presented.
Jean Demaison, Natalja Vogt
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The Vibrations of Polyatomic Molecules

2020
The vibrational spectroscopy of the semirigid (i.e., without large-amplitude motions) polyatomic molecule is reviewed. The normal modes are defined. The importance of molecular symmetry is pointed out. The Coriolis interaction and the anharmonic resonances are discussed.
Jean Demaison, Natalja Vogt
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The Kinetic Energy of Polyatomic Molecules

Physical Review, 1934
The Lagrangian and Hamiltonian expressions for the kinetic energy of a system of $N$ particles are obtained in such a form that the rotational, vibrational and coupling terms may be distinguished. The principal axes of inertia are used to define rotation.
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Autoionisation in polyatomic molecules

Journal of Physics B: Atomic and Molecular Physics, 1981
A brief discussion of the de-excitation probabilities associated with autoionisation, vibrational relaxation and predissociation channels suggests that the autoionisation route can dominate the others in high-n Rydberg molecular states. Experimental investigations at high resolution and energy verify this conclusion and demonstrate that the variety of ...
J P Connerade, M A Baig, S P McGlynn
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Polyatomic Molecules: Towards an Understanding of Chemical Bonds in Polyatomic Molecules

2004
The central problem of the chemical bond in polyatomic molecules is to clarify the relationship between constituent atoms and the character of the bonds between them. This problem has been studied on the basis of the valence bond (VB) theory, a generalization of the Heitler-London theory, and on the basis of the molecular orbital (MO) theory.
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Electrons in molecules: polyatomics

2013
This chapter begins by showing how symmetry considerations make it possible to construct molecular orbital diagrams for simple triatomics. In these molecules, the MOs extend over all the atoms—that is, the bonding is delocalized. In fact, it is a general feature of the MO approach that atomic orbitals on many atoms contribute to each MO. Unfortunately,
James Keeler, Peter Wothers
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The Entropy of Polyatomic Molecules

The Journal of Chemical Physics, 1934
A general expression for the entropy of the polyatomic molecule, rigid in the sense that only one form with a given set of moments of inertia is possible, is tested by comparison of calculated and experimental values. The results are satisfactory for molecules with as many as seven rotational degrees of freedom.
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