In the separation processes of boron isotopes by multiple-photon absorption of infrared radiation, a new photochemical products were produced from the Loser induced photochemical reaction of BC13 and CnF2n+2. A strong absorption peak of the new photochemical products at 1000 cm-1 overlapping with the v3 vibrational absorption band of 10BC13 thus the measurement of boron isotopes enrichment coefficient by infrared absorption spectra would be interfered.