水素分子の2中心2電子積分の解析的評価手法
A new analytic framework was developed for evaluating two-electron integrals over two-center systems in which interelectronic distance (correlation) is explicitly incorporated into the wave function. All integrals required for computing matrix elements of any diatomic two-electron molecule were derived as analytic recursion relations. As a demonstration in molecular physics, the ground-state energy and equilibrium internuclear distance of the hydrogen molecule were computed within the Born-Oppenheimer approximation.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/26626519