TY - JOUR
T1 - Volumetric intensity dependence on the formation of molecular and atomic ions within a high intensity laser focus
AU - Robson, Lynne
AU - Ledingham, Kenneth W.D.
AU - McKenna, Paul
AU - McCanny, Thomas
AU - Shimizu, Seiji
AU - Yang, Jiamin M.
AU - Wahlström, Claes-Göran
AU - Lopez-Martens, Rodrigo
AU - Varju, Katalin
AU - Johnsson, Per
AU - Mauritsson, Johan
PY - 2005/1
Y1 - 2005/1
N2 - The mechanism of atomic and molecular ionization in intense, ultra-short laser fields is a subject which continues to receive considerable attention. An inherent difficulty with techniques involving the tight focus of a laser beam is the continuous distribution of intensities contained within the focus, which can vary over several orders of magnitude. The present study adopts time of flight mass spectrometry coupled with a high intensity (8 × 1015 Wcm−2), ultra-short (20 fs) pulse laser in order to investigate the ionization and dissociation of the aromatic molecule benzene-d1 (C6H5D) as a function of intensity within a focused laser beam, by scanning the laser focus in the direction of propagation, while detecting ions produced only in a "thin" slice (400 and 800 μm) of the focus. The resultant TOF mass spectra varies significantly, highlighting the dependence on the range of specific intensities accessed and their volumetric weightings on the ionization/dissociation pathways accessed.
AB - The mechanism of atomic and molecular ionization in intense, ultra-short laser fields is a subject which continues to receive considerable attention. An inherent difficulty with techniques involving the tight focus of a laser beam is the continuous distribution of intensities contained within the focus, which can vary over several orders of magnitude. The present study adopts time of flight mass spectrometry coupled with a high intensity (8 × 1015 Wcm−2), ultra-short (20 fs) pulse laser in order to investigate the ionization and dissociation of the aromatic molecule benzene-d1 (C6H5D) as a function of intensity within a focused laser beam, by scanning the laser focus in the direction of propagation, while detecting ions produced only in a "thin" slice (400 and 800 μm) of the focus. The resultant TOF mass spectra varies significantly, highlighting the dependence on the range of specific intensities accessed and their volumetric weightings on the ionization/dissociation pathways accessed.
KW - ions
KW - lasers
KW - molecular ionization
KW - atomic ionization
UR - http://dx.doi.org/10.1016/j.jasms.2004.09.018
U2 - 10.1016/j.jasms.2004.09.018
DO - 10.1016/j.jasms.2004.09.018
M3 - Article
SN - 1044-0305
VL - 16
SP - 82
EP - 89
JO - Journal of the American Society for Mass Spectrometry
JF - Journal of the American Society for Mass Spectrometry
IS - 1
ER -