A key factor in parent and fragment ion formation on irradiation with an intense femtosecond laser pulse

作者: Hideo Harada , Seiji Shimizu , Tomoyuki Yatsuhashi , Shuji Sakabe , Yasukazu Izawa

DOI: 10.1016/S0009-2614(01)00662-5

关键词: IonFemtosecondIonization energyLaserPhotoionizationMolecular physicsFragmentation (mass spectrometry)Molecular electronic transitionChemistryPhotochemistryIonization

摘要: Abstract Two pairs of organic molecules (2,3-dimethyl-1,3-butadiene, 2,5-dimethyl-2,4-hexadiene; 1,4-cyclohexadiene, 1,3-cyclohexadiene) were irradiated with a high-intensity 120-fs laser pulse in the intensity region 10 14 W cm −2 . One molecule each pair had no allowed electronic transition cation at excitation wavelength 800 nm, resulting parent ion dominance. In contrast, counter molecule, which similar structure but absorption wavelength, showed heavy fragmentation negligibly small signal ion. The previously reported observations are explainable on basis proposed mechanism for femtosecond ionization.

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