Abstract

Coefficients of absorption for the O₂ Schumann–Runge continuum have been measured in the range 1270 Å ↔ 1745 Å. For the measurement, a microsecond flashing source with continuous spectral energy distribution and photographic detection techniques have been utilized. In previous measurements, H₂ discharges had been used almost exclusively. Three independent determinations by photographic photometry had given maximum coefficients of absorption between 460 cm⁻¹ and 490 cm⁻¹ (STP), whereas three independent photoelectric investigations yielded values between 390 cm⁻¹ and 403 cm⁻¹; the accuracy of the latter were estimated to be 5%–10%. Similar disagreement existed on the continuum oscillator strength. Our determination yields, for the maximum coefficient of absorption, 382 cm⁻¹±10% and f = 0.156, which is in good agreement with photoelectric measurements. Therefore, the formerly indicated discrepancy between photographic and photoelectric photometric techniques no longer exists.

© 1966 Optical Society of America

Photodissociation and Photoionization of Oxygen (O₂) as Inferred from Measured Absorption Coefficients

Po Lee
J. Opt. Soc. Am. 45(9) 703-709 (1955)

Photoionization and Absorption Coefficients of N₂O*

G. R. Cook, P. H. Metzger, and M. Ogawa
J. Opt. Soc. Am. 58(1) 129-136 (1968)

Ionization Potential of O₂*

James A. R. Samson and R. B. Cairns
J. Opt. Soc. Am. 56(6) 769-775 (1966)

Bandwidth Dependence of Measured uv Absorption Cross Sections of Argon*

Robert D. Hudson and Virginia L. Carter
J. Opt. Soc. Am. 58(2) 227-232 (1968)

Transmittance of Tin Films in the Far Ultraviolet

K. Codling, R. P. Madden, W. R. Hunter, and D. W. Angel
J. Opt. Soc. Am. 56(2) 189-192 (1966)