Superexcited states of NO molecule and their neutral dissociation processes have been studied both experimentally and theoretically. Neutral excited N^＊ and O^＊ atoms are detected by fluorescence spectroscopy for th...Superexcited states of NO molecule and their neutral dissociation processes have been studied both experimentally and theoretically. Neutral excited N^＊ and O^＊ atoms are detected by fluorescence spectroscopy for the NO molecule upon interaction with 800 nm intense laser radiation of duration 60 fs and intensity 0.2 PW/cm^2. Intense laser pulse causes neutral dissociation of superexcited NO molecule by way of multiphoton excitation, which is equivalent to single photon excitation in the extreme-ultraviolet region by synchrotron radiation. Potential energy curves （PECs） are also built using the calculated superexcited state of NO^＋. In light of the PECs, direct dissociation and pre-dissociation mechanisms are proposed respectively for the neutral dissociation leading to excited fragments N^＊ and O^＊.展开更多
We demonstrate the control of neutral fragmentation of methane（CH4） induced by a Ti：sapphire intense laser pulse（800 nm, 40 fs） by using a pump–probe spectroscopy. Enhancement of the fluorescence emission from t...We demonstrate the control of neutral fragmentation of methane（CH4） induced by a Ti：sapphire intense laser pulse（800 nm, 40 fs） by using a pump–probe spectroscopy. Enhancement of the fluorescence emission from the neutral radical CH（A2Δ → X2Π） induced by the intense laser field（~1014 W/cm2） is observed when the wavelength of the probe laser pulse is tuned to 400 nm. The phenomena are explained based on excitation enhancement of the super-excited state of the parent molecule resulting in an increase in neutral dissociation of the methane molecules.展开更多
文摘Superexcited states of NO molecule and their neutral dissociation processes have been studied both experimentally and theoretically. Neutral excited N^＊ and O^＊ atoms are detected by fluorescence spectroscopy for the NO molecule upon interaction with 800 nm intense laser radiation of duration 60 fs and intensity 0.2 PW/cm^2. Intense laser pulse causes neutral dissociation of superexcited NO molecule by way of multiphoton excitation, which is equivalent to single photon excitation in the extreme-ultraviolet region by synchrotron radiation. Potential energy curves （PECs） are also built using the calculated superexcited state of NO^＋. In light of the PECs, direct dissociation and pre-dissociation mechanisms are proposed respectively for the neutral dissociation leading to excited fragments N^＊ and O^＊.
基金partially supported by NSERC, DRDC Valcartier, Canada Research Chairs, CIPI, CFI, Femtotech, FQRNTthe National Basic Research Program of China (Nos. 2014CB921300)+2 种基金the National Natural Science Foundation of China (No. 61235003)the Research Fund for the Doctoral Program of Higher Education of Chinathe Scientific Research Foundation for Returned Scholars, Ministry of Education of China
文摘We demonstrate the control of neutral fragmentation of methane（CH4） induced by a Ti：sapphire intense laser pulse（800 nm, 40 fs） by using a pump–probe spectroscopy. Enhancement of the fluorescence emission from the neutral radical CH（A2Δ → X2Π） induced by the intense laser field（~1014 W/cm2） is observed when the wavelength of the probe laser pulse is tuned to 400 nm. The phenomena are explained based on excitation enhancement of the super-excited state of the parent molecule resulting in an increase in neutral dissociation of the methane molecules.
