Calibration of Vacuum-Ultraviolet Monochromators by the Molecular Branching-Ratio Technique*

摘要: The Lylman–Birge–Hopfield system of N2(a1Πg–X1Σg+) and the CO fourth-positive (A1Π–X1Σ+) are readily excited by low-energy electrons (100 eV). Together, these molecular systems have numerous emission bands spread uniformly over wavelength region 1150–2500 A. Because absolute transition probabilities for both been accurately measured, relative measurement intensities electron impact can be used as a convenient technique calibrating vacuum-ultraviolet (vuv) monochromators. This is basis branching-ratio described in this paper. These measurements placed on an comparing band to intensity hydrogen Ly-α line (1215 A) O i resonance triplet (1302, 4, 6 produced dissociative excitation H2 O2, respectively, standard lamp at wavelengths greater than 1500 results obtained method shown excellent agreement with spectral-response use atomic technique.