ɪn kˈɛmɪstɹi, ɪn pɚtˈɪkjʊlɚɹ ɪn tɹænsˈɪʃən stˈeɪt θˈiəɹi, ðɛɹ ɐpˈɪɹz ɐ sˈɜːʔn̩ "tɹænsmˈɪʃən kˌoʊɪfˈɪʃənt" fɔːɹ ˌoʊvɚkˈʌmɪŋ ɐ pətˈɛnʃəl bˈæɹiɚ.
In chemistry, in particular in transition state theory, there appears a certain "transmission coefficient" for overcoming a potential barrier.