move corresponding part of apply_o to interstitial operator
move corresponding part of apply_o to interstitial operator

toxa81/sirius,toxa81/sirius,dithillobothrium/SIRIUS,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,dithillobothrium/SIRIUS,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,dithillobothrium/SIRIUS,dithillobothrium/SIRIUS,toxa81/sirius,electronic-structure/sirius