The ultraviolet bands of OH Fundamental data

Abstract

The OH bands are of great importance for temperature measurements in flames and other combustion processes, as well as for a general exploration of the physical conditions in flames. A knowledge of the structure of the bands and the availability of certain band constants are prerequisites for such use. In the past such data were either completely unavailable or not sufficiently accurate or so spread over a large number of individual papers in various stages of progress that their use for application was very difficult. In the present report a new survey of these bands is presented. This consists of (1) new measurements of the whole wavelenght region 2800–3550 Å which are believe to be more complete and more accurate than those hitherto available (Table 14); (2) a revised analysis and classification of nine bands (Tables 13 and 14); (3) new intensity determinations and a location of all blends which may give rise to trouble in temperature measurements; (4) a recalculation of all band constants (Table 2); (5) a calculation and tabulation of rotational-transition probabilities necessary for the applications (Tables 4 and 5); (6) a table of the rotational and vibrational-energy levels (Tables 11 and 12); (7) a presentation of a simplified method for routine temperature measurements and tables for its use (Table 8); (8) a table of the infrared bands of OH as calculated from the data obtained from the ultraviolet bands. This report presents thus the fundamental data which are necessary for temperature measurements or other applications. The results of such temperature measurements and a further discussion of the special methods employed will be presented in a subsequent report.