Patrick W Dooley

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We demonstrate a method to measure strong field laser ionization of aligned molecules. The method employs a macroscopic field-free dynamic alignment, which occurs during revivals of rotational wave packets produced by a femtosecond laser pulse. We investigate the dependence of strong field ionization of N2 on molecular orientation. We determine that N2(More)
Shakeup of a two-electron system is investigated in the strong infrared laser field limit, both theoretically and experimentally. During tunnel ionization the electron shakes up a second electron to an excited bound state. Theoretically, a complete analytical theory of shakeup in intense laser fields is developed. We predict that shakeup produces one(More)
Ionization of D2 launches a vibrational wave packet on the ground state of D+2. Removal of the second electron places a pair of D+ ions onto a Coulombic potential. Measuring the D+ kinetic energy determines the time delay between the first and the second ionization. Caught between a falling ionization and a rapidly rising intensity, the typical lifetime of(More)
F. Légaré, Kevin F. Lee, I. V. Litvinyuk, P. W. Dooley, S. S. Wesolowski, P. R. Bunker, P. Dombi, F. Krausz, A. D. Bandrauk, D. M. Villeneuve, and P. B. Corkum National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6 Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1 Department of Physics &(More)
The performance of a 10 L sequencing batch reactor (SBR) treating wastewater discharged from a local slaughterhouse was examined in the laboratory at ambient temperature. The influent wastewater contained an average of 3360 mg L chemical oxygen demand (COD), 190 mg L total nitrogen (TN) and 22 mg L total phosphorus (TP). The duration of a complete cycle was(More)
Relatively high numbers (80,000 – 90,000 cells per milliliter) for January through early March 2002 at several Great South Bay (GSB) stations suggested the possibility that there would be an occurrence of a major brown tide event during the summer months. However, cell numbers decreased to less than 15,000 cells per milliliter by late March and have not(More)
We demonstrate that using intense femtosecond laser pulses to optically time ion flight can lead to a miniature time-of-flight mass spectrometer. After laser ionization, the molecular ion is accelerated by a static electric field and detected using a second, delayed laser pulse. The relative positions of the two laser foci determine the ion flight distance(More)
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