Papers and data we are looking for#
The papers below would improve the weakest parts of the models. Each is cited by a paper already curated. If you have access to one, or know of better data, please use the source form. Cite the paper there rather than attaching it. Many of the papers requested earlier are now curated (TC-543 to TC-625); what they left open is below. An item leaves this page when it is curated, with its register entry (#31).
Gases:
Vacuum-ultraviolet refractometry of the noble gases between their first resonance and 140 nm:
G. I. Chashchina, V. I. Gladushchak and E. Ya. Shreider, Opt. Spectrosc. 24, 542 (1968), argon;
G. I. Chashchina and E. Ya. Shreider, Opt. Spectrosc. 27, 79 (1969), krypton and xenon;
R. Abjean, A. Mehu and A. Johannin-Gilles, C. R. Acad. Sci. B 271 (1970).
The electronic absorption onsets and two-photon states of the polyatomic gases (TC-865): CO2’s weak absorption below its first band near 147.5 nm, SF6’s onset (only absorption evidence is curated: none detected at Ityaksov et al.’s sampled wavelengths down to 197.7 nm, TC-869), and the lowest two-photon states of CO2, CH4, SF6, N2O and O3. Without them these gases’ support records give no E2 and no derived band edge (TC-870).
An accuracy margin below each resonance (OEP 5, Q8): how far below \(E_1\) or \(E_2\) the fitted polynomial stays within its stated accuracy. It would be published as information on the support record, never as a rule, if optmat had evidence for one; it has none today.
Two-photon ionisation and absorption of the noble gases (the curation of TC-872 to TC-942; Two-photon ionisation and absorption). The papers requested in the first round are curated; what they left open is:
krypton’s two-photon ionisation cross section in a vector-drawn or tabulated form (OEP 6, Q2): every curve so far is a scan (L’Huillier, Tang and Lambropoulos 1989; Fink and Johnson 1990; McGuire 1981). Leads they cite include:
A. L’Huillier, L. Jönsson and G. Wendin, Phys. Rev. A 33, 3938 (1986);
B. Ritchie, Phys. Rev. A 16, 2080 (1977);
K. C. Kulander, Phys. Rev. A 36, 2726 (1987);
xenon between its two thresholds (Q3): only a scanned MQDT curve (Gangopadhyay et al. 1986);
any measured two-photon ionisation cross section of argon or neon;
measured bound two-photon strengths of He, Ne and Ar, and the higher members of every series (OEP 8);
material inputs for the continuum’s time-resolved two-photon loss (TC-903; OEP 8, Q6; TC-1057): identify them with a solprop SEP for the propagation response; use a coupled optmat OEP for new material quantities, models or interfaces. Tier-3 TDSE runs support the pair-frequency rule for the helium and argon continua (TC-1049), but no published small-split amplitude is curated. Explicit approximate responses are possible candidates; their transient behaviour is not thereby qualified;
Dakka et al.’s photoionisation rate factor (OEP 6, Q7; TC-892).
Converged ab initio dispersion, and the magnetic susceptibilities, of krypton and xenon. These would give Kr and Xe the theory backbone that He, Ne and Ar have.
Ultraviolet refractometry of SF6 below 458 nm, where its fit has no refractive data but Shelton’s harmonics: Wilmouth & Sayres’s scattering at 264-363 nm lies about 2 % above the model, and Ityaksov et al.’s at 198-270 nm about 5 % (TC-712, TC-150).
Neon’s refractivity virial (TC-744): Achtermann et al.’s 1993 optical B_R of neon and Huot and Bose’s B_ε, both as cited by Garberoglio and Harvey (2020). The package uses Orcutt and Cole’s static value, about three times theirs and the ab initio one. Both papers are curated (TC-771) and confirm the comparison. The choice of B_R is the author’s (OEP 4, Q18).
The mixtures’ cross second virials and densities near ambient, for OEP 4’s Phase 2. The citations are as printed by Tkaczuk et al. (2020) and Gernert (2013):
J. Brewer and G. W. Vaughn, J. Chem. Phys. 50, 2960 (1969);
M. L. Martin et al., Aust. J. Chem. 35, 1525 (1982);
W. F. Vogl and K. R. Hall, Physica 59, 529 (1972);
N. K. Kalfoglou and J. G. Miller, J. Phys. Chem. 71, 1256 (1967);
Vatter et al., Ber. Bunsenges. Phys. Chem. 100, 73 (1996);
Blancett et al.’s (1970) He–Ar and Kestin et al.’s (1981) He–Ne and Ne–Ar mixture densities.
All are curated (TC-780 to TC-784). Still wanted: a complete copy of Blancett et al. (the library’s scan clips pp. 82-88), and density data of the Ne–Ar mixtures and of air’s pairs (N2–O2, Ar–N2, Ar–O2) near ambient, whose absence leaves those defaults provisional (TC-779).
Infrared refractivity of the molecular gases, OEP 3’s validators (TC-756). The five candidates of OEP 3’s literature search are curated (TC-802 to TC-806): Rollefson and Havens’s CH4 (1.7-15 um), Matsumoto’s CO2 at 10.6 um and Tsankova et al.’s static CO are validators of the fits; Legay (1955) measured HCl alone; Mitrofanov et al.’s group delay of air at 3.7-4.15 um is recorded without a dataset, for want of a quantity for a group delay whose zero is not stated and of air as a registered material. Still wanted: Statescu, Phil. Mag. 30, 737 (1915), CO2’s infrared index by the prism method. No measurement of CO or N2O between 2 and 12 um was found.
Hohm’s measured polarizabilities against temperature: U. Hohm, Dissertation, TU Braunschweig (1989), the α(ω, T) of Ar, H2, O2 and CH4 that Hohm & Kerl fit but do not tabulate; and which of Hohm’s two 1994 xenon measurements, 0.31 % apart, is right (TC-606).
The molecules’ polarizability away from their reference temperature: an opt-in correction, linear in T - T_ref where a coefficient is measured (N2, O2, CO2; TC-730), with its wavelength dependence checked, and a model for H2’s rotational average far from room temperature. OEP 1 exposes the reference temperature and the coefficients only (its §7.13).
Molecular photoabsorption: the JILA Data Center Report No. 32 tabulations. Olney et al.’s S(−2) of N2O is 4.7 % above the one recomputed from Chan et al.’s published spectrum (TC-606).
Third-order response:
the calibration of the Maryland group’s absolute n2: the supplemental material of J. K. Wahlstrand, Y.-H. Cheng and H. M. Milchberg, Phys. Rev. Lett. 109, 113904 (2012);
any measured hyperpolarizability of N2O.
Ionisation:
static polarizabilities of Kr+, Xe+ and the molecular cations;
tunnelling structure coefficients (MO-ADK or weak-field asymptotic) for CH4, SF6 and N2O: L. B. Madsen et al., Phys. Rev. A 85, 053404 (2012) and 87, 013406 (2013);
D. W. Turner, A. D. Baker, C. Baker and C. R. Brundle, Molecular Photoelectron Spectroscopy (Wiley, 1970): the original of the N2O and CO2 vertical energies;
a modern threshold of SF6 (Frost et al.’s 1967 value is of unstated kind);
the source of solprop’s PPT Stark shift and dipole correction, which are not in Ilkov et al. 1992 (perhaps L. Bergé et al., Rep. Prog. Phys. 70, 1633 (2007));
the PPT originals: A. M. Perelomov, V. S. Popov and M. V. Terent’ev, Sov. Phys. JETP 23, 924 (1966); A. M. Perelomov and V. S. Popov, Sov. Phys. JETP 25, 336 (1967), which would settle the factor of 2 in Ilkov et al.’s Eq. (8);
R. H. Garvey, C. H. Jackman and A. E. S. Green, Phys. Rev. A 12, 1144 (1975): the model potentials behind Batishchev et al.’s and Trinh et al.’s rates.
Raman:
for Q-branch line mixing: relaxation-matrix (exponential-gap or energy-corrected sudden) parameters of N2, O2 and CO2 fitted to Q-branch spectra up to tens of atmospheres, and tabulated Q-branch widths or time-domain dephasing measured above 10 atm, where the branch has collapsed;
the vibrational O and S branches (their anisotropic elements beyond H2’s and D2’s), and the line shapes below the Dicke cutoff (TC-686, TC-688);
the rotational constants of N2O (a primary source; the Weber volume has none);
the Q-branch widths of CO2 and N2O, and N2O’s depolarisation ratios;
Komasa et al.’s 2011 Supporting Information (the per-level uncertainties), and a vocabulary quantity for rovibrational level energies to hold their tables;
whether Murray & Javan’s (1972) D2 widths are half or full widths (TC-586).
Ozone: an independent zero-point vibrational correction to its polarizability, and the supplementary material of Christodouleas et al. (2010). The higher dispersion orders of its measured-absorption term (the GVD and beyond), which are repeated gradients of the grid rather than derivatives of the evaluated spline (TC-732).
Solids (the fused-silica models and the data curated for the next ones; TC-399, TC-393, TC-325 onwards):
solprop’s solids (TC-546, TC-619, TC-648):
silver and gold beyond 12.4 µm: measured far-infrared data, such as M. A. Ordal et al., Appl. Opt. 26, 744 (1987) (gold); only Drude curves are curated;
the vacuum ultraviolet of silver and gold (40-200 nm), where the curated sources spread by 20-50 % in k (TC-646): a modern measurement of both n and k;
MgF2’s temperature dependence: A. Feldman et al., NBS Tech. Note 993 (1979);
Silica’s linear index:
Popova et al. (1972), the IR data behind Kitamura’s model;
the numbers behind Tan, Lemon & French’s 2003 VUV constants (figures only);
J. H. Wray and J. T. Neu, J. Opt. Soc. Am. 59, 774 (1969): silica to 1100 K.
Franta’s model: the supplement of the 2025 Ta2O5 paper.
Raman gain: a second absolute measurement of fused silica’s Raman gain, bulk or in a pure-silica-core fibre (TC-696 rests on Stolen & Ippen’s one), and its polarised and depolarised spectra, to test Lin & Agrawal’s isotropic and anisotropic parts.
n2: D. Milam, M. J. Weber and A. J. Glass, Appl. Phys. Lett. 31, 822 (1977), the fluoride crystals’ n2; the other originals behind Weber, Milam & Smith’s 1978 tables.
Damage and ionisation: B. C. Stuart et al., J. Opt. Soc. Am. B 13, 459 (1996); L. Sudrie et al., Phys. Rev. Lett. 89, 186601 (2002); Keldysh, Sov. Phys. JETP 20, 1307 (1965).