Response to "Comment on 'Phase transition temperatures of 405-725 K in superfluid ultra-dense hydrogen clusters on metal surfaces' [AIP Advances 6, 045111 (2016)]"

TL;DR

This paper responds to critiques of previous work on superfluid ultra-dense hydrogen clusters, clarifying experimental interpretations, theoretical descriptions, and previous measurements, emphasizing the distinct properties and existing data on H(0).

Contribution

It provides a detailed rebuttal to critiques, clarifies misconceptions about Rydberg states, and highlights prior experimental and theoretical findings on ultra-dense hydrogen.

Findings

Superfluid and superconductive properties of H(0) have been previously published.

Experimental spectra are neutral time-of-flight spectra, not ion spectra.

Internuclear distances in various hydrogen molecules have been precisely measured.

Abstract

In this invited response we answer all comments by Engelen and Hansen [arXiv:2207.07844]. We point out that the superfluid and superconductive properties of H(0) have been published previously. We explain some differences between covalently bonded molecules and the molecules in the ultradense matter H(0) form, and explain some aspects of the energetics of H(0) molecules during Coulomb explosions. We point out that the experimental spectra shown in our publication are not ion time-of-flight spectra but neutral time-of-flight spectra with the peak width given by the internal energetics and not by experimental factors. We point out that no phase diagram has been measured for H(0). Further we point out that a Rydberg state is a hydrogenic state and thus that all hydrogen atom states are Rydberg states. That Rydberg states always have large principal quantum numbers is a complete misunderstanding. We point out that a QM description of H(0) is published. We point out that the internuclear distances in p(0), D(0) and pD(0) have been measured by rotational spectroscopy in two publications for three different spin states. They are measured in the pm range with fm precision.