ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - IV. Radio recombination lines and evolution of star formation efficiencies - C. Zhang; Evans, Neal J.; T. Liu; Wu, J. -W.; Ke Wang; Liu, H. -L.; Zhu, F. -Y.; Ren, Z. -Y.; Dewangan, L. K.; Lee, Chang Won; Li, Shanghuo; Bronfman, L.; et al. (\mnras, 2022)
Keywords: Astrophysics - Astrophysics of Galaxies; H II regions; ISM: clouds; radio lines: ISM; stars: formation