. "105727017"@en-us . . . "the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses"@en-us . "femtochemistry"^^ . . . "106090064"^^ . . "femtochemistry"@en-us . "06090064-n"^^ . "0"^^ . . . . "0"^^ .