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Cold Chemical Reactions Between Molecular Ions and Neutral Atoms

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An Introduction to Cold and Ultracold Chemistry

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Abstract

In previous chapters we have studied physical and chemical processes in atom–ion hybrid systems. However, the field of hybrid atom–ion systems is evolving toward the study of molecular ion–atom interactions. This emerging field brings a new degree of control into play, i.e., the internal degrees of freedom in one of the colliding partners. The presence of internal degrees of freedom is crucial to elucidating the ultimate nature of ion–neutral collisions, including stereochemical effects, and the possibility of sympathetic cooling of molecular ions. Furthermore, molecular ion–atom hybrid systems are interesting for the development of novel high-precision spectroscopy techniques for rotational states of molecular ions [1,2,3].

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Notes

  1. 1.

    In general, the same condition applies to r −, which can be used to change from trajectory to trajectory where the vibrational motion starts [16].

  2. 2.

    Here, r = r 12 based on Fig. 11.2.

  3. 3.

    This statement is equivalent to saying that charge-transfer processes are not considered.

  4. 4.

    When the Langer approximation is used for the rotational quantum number, i.e., j(j + 1) = (j + 1∕2)2, the final rotational quantum number is given as \(j'=-1/2+\sqrt {\frac {\vec {J}'\cdot \vec {J}'}{\hbar ^2}}\).

  5. 5.

    It is worth recalling that the rate coefficient is defined as 〈σv〉, where 〉〈 stands for the thermal averaged.

  6. 6.

    The statistical capture model also presents some difficulties when the three-body system shows a very shallow well depth.

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  1. Fritz Haber Institute of the Max Planck Society, Department of Molecular Physics, Berlin, Germany

    Jesús Pérez Ríos

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Pérez Ríos, J. (2020). Cold Chemical Reactions Between Molecular Ions and Neutral Atoms. In: An Introduction to Cold and Ultracold Chemistry. Springer, Cham. https://doi.org/10.1007/978-3-030-55936-6_11

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