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In a laser-irradiated plasma, the Langdon effect makes the electron energydistribution function (EEDF) tend to a super-Gaussian distribution, which hasimportant influences on laser plasma instabilities. In this work, theinfluences of a super-Gaussian EEDF on the convective stimulated backward Ramanscattering (SRS) and stimulated backward Brillouin scattering (SBS) are studiedsystematically for a wide range of typical plasma parameters in the inertialconfinement fusion (ICF). Distinct behaviors are found for SRS and SBS in thevariation trend of the peak spatial growth rate and the correspondingwavelength of the scattered light. Especially, the Langdon effect on the SBS inplasmas with different ion species and isotopes is analyzed in detail, and theparameter boundary for judging the variation trend of the peak spatial growthrate of SBS with the superGaussian exponent is presented for the first time. Incertain plasma parameter region, it is found that the Langdon effect couldenhance SBS in mixed plasma, which may attenuate the improvement in suppressingSBS by mixing low-Z ions into the high-Z plasma. These comprehension of Langdoneffect on LPIs would contribute to a better understanding of SRS and SBS inexperiments.

Investigation of Langdon effect on the stimulated backward Raman and Brillouin scattering