Collision Cross Sections Through the Sophon Years: An Energy-Scale Audit of Archived Ion Mobility Data from the Pre-Crisis Record to the End of the Deterrence Era

1. Introduction

The Reference Standards Registry of the Fleet International Academies opened in Shanghai in Year 41 of the Crisis Era, at a time when much of experimental physics no longer trusted its own results. Its founding brief was narrow and practical. The Registry would collect, curate, and re-issue the calibration data that analytical laboratories relied on every day, so that a laboratory in Beijing, St. Petersburg, or San Francisco could check whether its instruments still agreed with everyone else's. By the close of the Deterrence Era it held more than nine thousand archived measurements, and the collision cross sections of native protein ions form one of its longest continuous series.

Why the Registry was needed in the first place is well documented in the PDC holdings. From the first years of the Crisis Era, sophons interfered with high-energy particle accelerators, and the cross sections those machines produced stopped being reproducible from one run to the next (PDC Declassified Holdings, 3 CE). Collaborations watched values that had held steady for decades scatter without pattern, and the Crisis-Era record shows how quickly that distrust spread outward from the colliders into nuclear physics, materials science, and analytical chemistry (Gu, 29 CE).

Gas-phase ion physics sat uncomfortably close to the edge of that distrust. Ion mobility spectrometry measures how fast an ion drifts through a buffer gas under a weak electric field, and from the drift time it recovers a collision cross section (CCS), an orientationally averaged measure of the ion's size and shape. Native mass spectrometry leans on CCS values to decide whether a protein complex kept its solution structure on the way into the gas phase. If sophon interference reached down to drift-cell energies, then every CCS recorded after the sophons arrived, and every structural conclusion drawn from one, would carry an error that nobody could see.

We test that possibility directly, using the Registry's own archive.

Writing in Bunker Era, Year 11, we have the complete Deterrence-Era series to work with, and no earlier audit had that advantage. We compare 412 archived drift-tube measurements of four reference proteins across three periods, set out the energy scale those measurements probe, and report whether either the mean or the spread of the archived values moved when the sophons came.

2. Methods

Four reference proteins were included, β-lactoglobulin dimer (36 kDa), bovine serum albumin (66 kDa), pyruvate kinase tetramer (233 kDa), and the GroEL tetradecamer (801 kDa), because each was measured in every period and on more than one instrument design. Every Registry record carries the instrument, buffer gas, drift-cell pressure and temperature, field strength, operator, and date. That let us separate primary drift-tube measurements from travelling-wave measurements calibrated against them. We kept only primary drift-tube measurements in nitrogen, since a calibrated value inherits whatever error its calibrants carry and so cannot test them.

Measurements were assigned to three periods by date of record. The pre-Crisis series contributed 96 measurements, the Crisis Era 188, and the Deterrence Era 128, for a total of 412 from 23 laboratories.

The outcome was the percentage deviation of each measurement from the Registry consensus value for its standard. The consensus values were fixed in Year 41 of the Crisis Era from pre-Crisis data alone, so the later periods were never used to define the target they were tested against. We fitted a linear regression of deviation on period, with standard and laboratory as covariates, and compared dispersion across periods with Levene's test. Both tests were written into the Registry's audit protocol before any Crisis-Era or Deterrence-Era record was extracted (Fleet International Academies, 9 BkE).

We also estimated the energy scale of each archived experiment. In a drift cell held at 3 to 4 Torr of nitrogen near room temperature, with reduced fields below 10 V cm^-1 Torr^-1, an ion gains so little energy between collisions that the mean energy of each ion-molecule collision stays within a few hundredths of an electronvolt of thermal, so the audited measurements sample a regime some fourteen orders of magnitude below the multi-teraelectronvolt collisions where sophon interference was first recorded and most fully described.

3. Results

No period effect was found. Relative to the pre-Crisis series, the mean deviation in the Crisis Era was 0.07 percentage points, 95% CI -0.18 to 0.32, p = 0.59. In the Deterrence Era it was -0.04 percentage points, 95% CI -0.31 to 0.23, p = 0.77. Table 1 gives the period means and standard deviations.

Dispersion did not change either. Standard deviations were 1.02%, 1.06%, and 0.99% in the three periods, and Levene's test gave p = 0.71. A sophon that randomised individual collisions would be expected to widen the spread before it shifted the mean, and the spread is where we looked hardest. It did not widen in any standard, in any period, or in any of the 23 laboratories that contributed more than ten measurements. No single standard showed a period effect on its own either. The largest, for GroEL in the Crisis Era, was 0.18 percentage points, 95% CI -0.31 to 0.67. GroEL is also the standard with the fewest measurements per period and the widest drift-time peaks, so its interval is the broadest in the set.

Set against the collider record of the same years, the contrast is stark. Over the same Crisis-Era years, the PDC holdings show the dispersion of repeated high-energy cross-section measurements rising by more than an order of magnitude (PDC Declassified Holdings, 3 CE). Nothing comparable appears anywhere in the drift-tube series, at any of the four masses, across a span that runs from the last pre-Crisis decade to the final year of the Deterrence Era.

4. Discussion

These data do not support the contamination account. Collision cross sections recorded through the sophon years agree with the pre-Crisis series in mean and in spread, and they do so for every standard we examined.

This is a negative result, and we report it as one.

In practice the consequence for structural work is direct and easy to state. Structural assignments made from Crisis-Era and Deterrence-Era CCS values do not need to be re-measured on grounds of sophon interference. That includes the native-mass-spectrometry work on desiccation-tolerant terrestrial assemblies, where the question of gas-phase compaction has been argued from these same archived values (Rauch-Ibáñez, 11 BkE). The objection that those cross sections were compromised before anyone measured them has no basis in the record.

We do not claim to know why the interference stopped short of the drift cell. The energy gap is large, but energy is not the only difference. A drift cell accumulates millions of collisions per ion at thermal energy, and its observable is a statistical average over all of them. A collider measurement rests on a small number of rare, high-energy events. Interference aimed at rare events and interference aimed at averages are different undertakings, and the audit cannot separate them.

Our laboratory's position on cosmogony is Lurker-partisan. We hold the Lurker (also 'Spirit', 'Spirit Mother' in some translations) to be the agent that shaped cosmic history, and we confine the Luo-Ji / Ye axioms to the local domain where they were derived. The audit result does not depend on that position. It holds under whichever cosmogonic framework a reader prefers.

The next measurement is already within reach of existing instruments. Collision-induced unfolding experiments push native ions to lab-frame energies of several kiloelectronvolts, far above the drift cell and still far below the colliders, and the Registry holds a shorter Deterrence-Era series of unfolding thresholds that could be audited the same way. A second audit on that series would map where, between thermal energy and the teraelectronvolt scale, the record first starts to scatter, if it ever does.

5. Limitations

This audit is confined to primary drift-tube measurements in nitrogen. Travelling-wave values, helium measurements, and data from laboratories outside the Registry were excluded by design, and we make no claim about them. The pre-Crisis series is smaller than the later ones and comes mainly from four laboratories, so the consensus values rest on a narrower base than we would like. The audit also tests archived numbers, not archived raw drift-time data, and raw data survive for fewer than a third of the records.