Spectral line

Catalysis

Photochemistry

Materials science

Pyrazine

Pyridazine

Absorption (acoustics)

Gas phase

Wavelength

Stereochemistry

Physical chemistry

Disproportionation

Physics

Organic chemistry

Optics

Astronomy

Composite material

Pyrimidine

Analytical Chemistry (journal)

Chemistry

Optoelectronics

Absorption spectroscopy

Monochromator

Photodissociation

Chemical Physics Letters

The gas phase UV absorption spectra of pyrazine, pyrimidine and pyridazine were determined by using a D2-lamp coupled to a monochromator-PM system between 200 and 380 nm, at 353 ± 3 K and at pressures lower than their vapor pressure (0.08–0.5 torr). The obtained spectra consist of a broad continuum with low intense absorption bands at 200–380 nm. Absorption of the investigated compounds at wavelengths>290 nm is non-negligible (σλ > 290 nm in the order of 10−20 cm2 molecule−1). These results indicate that, pyrazine, pyrimidine and pyridazine could be removed from the troposphere via photolysis reactions.

Gas-phase UV absorption spectra of pyrazine, pyrimidine and pyridazine