H2 Lyman-Band Oscillator Strengths

Absorption oscillator strengths for thirty rotational lines in nine vibrational bands of the Lyman transition, $B^1{\Sigma }_u^{+}$ , of H₂ have been obtained from equivalent widths measured photoelectrically under high resolution. Argon and helium continua were used in the third and first orders, respectively, of the grating. A curve‐of‐growth analysis of the measured equivalent widths of the Doppler‐broadened lines yielded the $f$ values. Our results are in agreement with electron‐scattering data obtained by Geiger and Topschowsky; consequently, there is now strong evidence from absorption $f$ value and emission lifetime data for a significant variation of dipole transition moment with internuclear separation in the Lyman transition.