Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...

ABSTRACT We have measured the profiles of the Ca ii H and K chromospheric emission lines in 147 main‐sequence stars of spectral type M5–K7 (masses 0.30–0.55 M⊙) using multiple high‐resolution spectra ...

Alluxa introduces two Hydrogen Alpha (H-Alpha) Emission Line Filters that are revolutionizing the ultra-narrow optical filters market. Though these new filters have been specifically tailored to ...

Recent studies have made significant advancements in the understanding of X-ray emission spectra, particularly focusing on the Kα and Kβ lines of elements like copper and scandium. For instance ...

New California Air Resources Board regulations mandate exhaust emission reductions for docked car carriers and tankers.