Abstract
The theory of large extra compactified dimensions of space (ADD-model) predicts that gravity may become strong in a compactification space of the size of a molecule and may affect the vibrational motion of a molecule. In triatomic molecules like hbox {NO}_{{2}} nuclear dynamics is strongly coupled to electronic dynamics at the intersection of electronic states (conical intersection). We discuss experimental results on hbox {NO}_{{2}} which reveal that the collision-free molecule optically excited into a symmetric stretch vibration mode of an electronic state with conical intersection undergoes an irreversible non-radiative transition into an asymmetric stretch vibration mode in combination with a change of the electronic state. We suggest ascribing this irreversible non-radiative transition to a gravitational perturbation on the vibrational motion in hbox {NO}_{{2}}. This gravitational perturbation deactivates the upper state of the optical transition. The width of the absorption line is given by the characteristic time of the gravitational perturbation and not by the radiative lifetime of the excited molecular state.Graphical abstract
Highlights
The structure of a molecule is commonly described in the 3-dimensional space we see
Contrary to the model of interelectronic level mixing in which the vibronic coupling leads to molecular eigenstates comprising a mixture of A 2B2 and X 2A1 characters, the model of the space-coupled molecule implies that gravitational perturbation on the vibrational motion causes an irreversible vibronic transition of the molecule from the symmetric stretch and bending vibration mode in the state A 2B2 to the asymmetric stretch vibration mode in the state X 2A1
The gravitational perturbation on the vibrational motion in the state |e, 1 > affects the absorption properties of the optical transition |g, 1 >↔ |e, 1 > as we show in Ref. [11]
Summary
The structure of a molecule is commonly described in the 3-dimensional space we see. modern physics (string theory) requires six or seven extra spatial dimensions (e.g. [1,2]). Contrary to the model of interelectronic level mixing in which the vibronic coupling leads to molecular eigenstates comprising a mixture of A 2B2 and X 2A1 characters, the model of the space-coupled molecule implies that gravitational perturbation on the vibrational motion causes an irreversible vibronic transition of the molecule from the symmetric stretch and bending vibration mode in the state A 2B2 to the asymmetric stretch vibration mode in the state X 2A1. The description of this effect requires the assumption of an irreversible non-radiative transition |e, 1 >→ |e, 2 > in the collision-free molecule Another unusual result is the observation of two characteristic times τR ≈ 35 μs and τ0 ≈ 3 μs associated with each hyperfine structure (hfs)-level of the optically excited molecule.
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