GET /lines1.pl

nist.gov:nist-atomic-spectra-database-api

Summary: Get spectral lines (transitions)
Operation ID: getSpectralLines
Auth: none
Description

Retrieves spectral line transition data. Note: This endpoint is complex and may require additional parameters for successful queries. Returns HTML with wavelength, intensity, and transition probability data.

Parameters (5)

format (integer, query, optional, default: 0)

Output format (0=HTML, 1=ASCII text, 2=BibTeX)

Constraints: {'enum': [0, 1, 2]}

low_w (number, query, optional)

Lower wavelength limit (in Angstroms or specified unit)

spectra (string, query, required)

Atomic spectra specification (e.g., 'H I', 'Fe I-II')

unit (integer, query, optional, default: 0)

Wavelength unit (0=Angstroms, 1=nm, 2=micrometers, 3=cm-1, 4=eV, 5=GHz, 6=THz)

Constraints: {'enum': [0, 1, 2, 3, 4, 5, 6]}

upp_w (number, query, optional)

Upper wavelength limit (in Angstroms or specified unit)

Examples (2)

TitleTypeURLAction
Query spectral lines data openapi-spec https://physics.nist.gov/cgi-bin/ASD/lines1.pl?spectra=H_I&format=1&low_wl=300&upp_wl=700
Get spectral lines (transitions) openapi-spec https://physics.nist.gov/cgi-bin/ASD/lines1.pl?spectra=H I&low_w=4000&upp_w=7000

Probe History

Latency

Status Codes

TimeStatusLatencySize
2026-03-23 10:37:00.394075 200 850ms
2026-03-23 10:11:18.847832 200 646ms

Response Changes

WhenOldNew
2026-03-23 10:37:00.394075 a3b5a6fcd1ed 893919dbbd7b