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The comment by K. Hansen suggests that the time-of-flight mass spectrometrydata in one table in our paper from 2103 in IJMS should be due to a protoncontamination and correspond to protons p instead of deuterons D. The evidencefor such a suggestion is a re-plotting of our data, giving a bond distance of5.0 pm instead of 2.3 pm, corresponding to state s = 3 instead of s = 2 in theultra-dense hydrogen. However, protium has indeed been studied on the nextpages in our paper, giving shorter time-of-flights as expected. A replotting ofour protium results as suggested by Hansen gives a best fit mass of 0.6 u,showing that the suggested procedure gives consistently too small mass. Hansenalso rejects the rotational energy transfer model as due to our use of D in theanalysis of the data. However, this model has been applied successfully in twoprevious publications, including experiments using protium. Hansen alsosuggests that the protium is due to a contamination of the source; however, thegas feed (H2 or D2) and its result is well controlled and monitored. The mostlikely source of protons was instead laser-induced nuclear fusion, but thelaser intensity in these experiments was a factor three too low to give strongfusion. Thus, the suggestion by Hansen is not valid.

Comment on "K. Hansen, Int. J. Mass Spectrom. 399-400 (2016)51"