The orbital symmetry of the ? bonding orbital is different from that of a antibonding orbital, which has one nodal plane containing the internuclear axis and a second nodal plane perpendicular to this axis between the atoms.
32.
Although in the hydrogen molecule the exchange integral, Eq . ( 6 ), is negative, Heisenberg first suggested that it changes sign at some critical ratio of internuclear distance to mean radial extension of the atomic orbital.
33.
This phenomenon is referred to as Fermi heap, and plays an important role in chemical bonding by allowing both electrons to be localized in the internuclear region and thus shielding the positively charged nuclei from electrostatic repulsion with one another.
34.
Other theoretically weaker transitions have not yet resulted in an observation with the exception of Hay and Dunning, who made provisions for four transitions that are perpendicularly polarized at the internuclear axis; in other words, with ?? = ?.
35.
This coupling, also known by EPR spectroscopists as hyperfine coupling, is on the order of MHz, vs the usual internuclear ( J ) coupling observed in conventional NMR spectra, which are on the order of a few Hz.
36.
Because the moment of inertia about the internuclear axis is vanishingly small relative to the other two rotational axes, the energy spacing can be considered so high that no excitations of the rotational state can occur unless the temperature is extremely high.
37.
Internuclear ophthalmoplegia occurs when MS affects a part of the brain stem called the medial longitudinal fasciculus, which is responsible for communication between the two eyes by connecting the abducens nucleus of one side to the oculomotor nucleus of the opposite side.
38.
Since the equilibrium internuclear separation for the neutral molecule is smaller than for the ionized one, the ionic nuclear wave packet finds itself on the repulsive side of the ground state potential well and starts to cross it ( see Fig . 3a ).
39.
The distinction between states B and C is that they are correlated with ions whose semi-occupied orbital " p " is in a plane parallel to the internuclear axis for the state B and perpendicular to this axis for the state C.
40.
But the F3-B1 interaction is definitely pi, as it's side-on overlap of p orbitals with a nodal plane right down the F3-B1 internuclear axis .-- talk ) 11 : 04, 19 April 2012 ( UTC)
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