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For heteronuclear diatomic molecules, the u/g symbol does not correspond to any exact symmetry of the electronic molecular Hamiltonian. In the case of less symmetric molecules the molecular term symbol contains the symbol of the group representation to which the molecular electronic state belongs. It has the general form:
Molecular symmetry in physics and chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry. Molecular symmetry is a fundamental concept in the application of quantum mechanics in physics and chemistry, for example, it can be used to predict or explain many of a molecule's properties, such as its dipole moment and its allowed ...
Heteronuclear molecules. A heteronuclear molecule is a molecule composed of atoms of more than one chemical element. [1] [2] For example, a molecule of water (H 2 O) is heteronuclear because it has atoms of two different elements, hydrogen (H) and oxygen (O). Similarly, a heteronuclear ion is an ion that contains atoms of more than one chemical ...
Diatomic molecules consist of a bond between only two atoms. They can be broken into two categories: homonuclear and heteronuclear. A homonuclear diatomic molecule is one composed of two atoms of the same element. Examples are H 2, O 2, and N 2. A heteronuclear diatomic molecule is composed of two atoms of two different elements.
A space-filling model of the diatomic molecule dinitrogen, N 2. Diatomic molecules (from Greek di- 'two') are molecules composed of only two atoms, of the same or different chemical elements. If a diatomic molecule consists of two atoms of the same element, such as hydrogen (H 2) or oxygen (O 2), then it is said to be homonuclear.
Based on atomicity, molecules can be classified as: Monoatomic (composed of one atom). Examples include He , Ne , Ar , and Kr . All noble gases are monoatomic. Diatomic (composed of two atoms). Examples include H 2 , N 2 , O 2 , F 2 , and Cl 2
Molecular orbitals are said to be degenerate if they have the same energy. For example, in the homonuclear diatomic molecules of the first ten elements, the molecular orbitals derived from the p x and the p y atomic orbitals result in two degenerate bonding orbitals (of low energy) and two degenerate antibonding orbitals (of high energy). [13]
Looking again at the characters obtained for the 3D representation above (3, -1, 1, 1), we only need simple arithmetic to break this down into irreps. Clearly, E = 3 means there are three irreps and a C 2 representation sum of -1 means there must be one A and two B irreps so the only combination that adds up to the characters derived is A 1 + B ...
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