Development and validation of new analytical or data tools for seized drug analysis require demonstration of the approach's ability to accurately detect the components of complex, realistic drug mixtures. However, gaining access to these types of samples, or the data from these types of samples, can be difficult.

SRM 2921a electronic files containing the certified values and uncertainties and the data used to assign those values. The concentration of human cardiac troponin I (cTnI) in SRM 2921a was certified using an LC-MS method with calibrants prepared from SRM 2921.

Experimental data and simulation code and data for figures for the manuscript "Millimeter Wave Readout of a Superconducting Qubit", which has been submitted for publication and available as a preprint on arXiv (https://doi.org/10.48550/arXiv.2603.13837).

This dataset contains replicate extracted mass spectra of 330+ drug standards collected using gas chromatography electron ionization mass spectrometry (GC-EI-MS). There are ten replicate mass spectra for each compound - five spectra collected on two different instruments - in .csv files. Also included are pdf's of mass spectral heat maps for each compound. See the readme file for more information.

X-ray computed tomography (XCT) is a nondestructive method that uses multiple X-ray projections to create detailed 3D internal models of materials without damaging them. In the semiconductor industry, XCT is used for failure analysis, quality control, and process improvement. Integrated circuit (IC) packages can be inspected with XCT to detect failures and counterfeit components. However, there are limited data sets publicly available containing XCT measurements of advanced packages.

The NIST DART-MS Forensics Database is an evaluated collection of in-source collisionally-induced dissociation (is-CID) mass spectra of compounds of interest to the forensics community (e.g. seized drugs, cutting agents, etc.). The is-CID mass spectra were collected using Direct Analysis in Real-Time (DART) Mass Spectrometry (MS), either by NIST scientists or by contributing agencies noted per compound. The database is provided as a general-purpose structure data file (.SDF).

Data and input files for "X-ray Absorption and Resonant X-ray Emission at the Carbon Edge of Li_2CO_3".

Contents:
1. Inputs and outputs for calculations of ground-state DFT & GW are in the the ABI directory
2. Inputs and outputs for the MD simulations are in the MD directory
3. Inputs and outputs for the X-ray calculations are in the Xray directory
4. Experimental data are in the Expt directory

Plotting scripts for producing the figures are also included

Data and analysis supporting the article "Two-color measurements supporting a revised formulation for the refractive index of air," by PF Egan in Measurement Science and Technology (2026).

The measured data are in the files "data-GASNAME-2color.csv" where GASNAME is

* carbon dioxide

* oxygen

* bMixN787

* bMixN200

* dry air with a CO2 mole fraction of 388.86 ppm

* water

We investigate the role of magnetic sublevels in Autler–Townes spectra of Rydberg atoms driven by radio-frequency (RF) fields with arbitrary polarization. While conventional treatments predict two symmetric sidebands from independent $m_J$ transitions, experiments have reported additional unexplained spectral features. We show that these arise from elliptical RF polarization, which coherently couples multiple magnetic sublevels and requires a full multi-level treatment.

This dataset contains the LQMetric and OpenLQM quality component values for the latent impression distal phalanx images of NIST Special Database (SD) 302h. OpenLQM is an open-source reimplementation of LQMetric, designed to keep computed values between the two software applications as identical as possible. All images of SD 302h were run through both the version of LQMetric included with Universal Latent Workstation v6.6.7 and OpenLQM v1.0.0 on a machine running Windows 11. The complete output for each software is available separately.