**3. Conclusions**

We considered the MHIs formed by collisions of low-energy protons with the SFHA. We found that the resulting MHIs would lack a significant number of terms compared to the MHIs formed by collisions of low-energy protons with the usual hydrogen atoms.

We showed that, in this situation, the radiative transition between the terms of such MHIs of the lowest quantum numbers would be between the terms 5fσ and 4d<sup>σ</sup>. We

calculated the position of the edge of the corresponding molecular band and found it to be at the frequency 14,700 cm<sup>−</sup><sup>1</sup> or equivalently at the wavelength of 680 nm, which belongs to the visible range. So, it should be easier to observe this band compared to the spectral bands that are completely beyond the visible range.

We emphasized that these results open up another avenue for finding an additional experimental proof of the existence of the SFHA. Namely, if the SFHA is present in the gas (in addition to the usual hydrogen atoms) on which a beam of low-energy protons is incident, then the relative intensity of the band, corresponding to the radiative transitions between the terms 5fσ and 4dσ of the MHIs, would be enhanced compared to the absence of the SFHA.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** All data is included in the manuscript.

**Conflicts of Interest:** The author declares no conflict of interest.
