10 research outputs found
10 THz Ultrafast Function Generator - generation of rectangular and triangular pulse trains-
We report the synthesis of arbitrary optical waveforms by manipulating the
spectral phases of Raman sidebands with a wide frequency spacing line-by-line.
Trains of rectangular and triangular pulses are stably produced at an ultrahigh
repetition rate of 10.6229 THz, reminiscent of an ultrafast function generator.Comment: 7 Pages, 5 Figure
Generation of trains of arbitrary waveforms and their repeated revivals
We report on manipulation and characterization of highly-discrete coherent spectrum. It is shown that trains of arbitrary optical waveforms are generated and furthermore they revive repeatedly by adding material positive dispersions
Generation of trains of arbitrary waveforms and their repeated revivals
We report on manipulation and characterization of highly-discrete coherent spectrum. It is shown that trains of arbitrary optical waveforms are generated and furthermore they revive repeatedly by adding material positive dispersions
Generation of trains of arbitrary waveforms and their repeated revivals
We report on manipulation and characterization of highly-discrete coherent spectrum. It is shown that trains of arbitrary optical waveforms are generated and furthermore they revive repeatedly by adding material positive dispersions
Mechanisms and time-resolved dynamics for trihydrogen cation (H 3 + ) formation from organic molecules in strong laser fields
Strong-field laser-matter interactions often lead to exotic chemical reactions. Trihydrogen cation formation from organic molecules is one such case that requires multiple bonds to break and form. We present evidence for the existence of two different reaction pathways for H3 + formation from organic molecules irradiated by a strong-field laser. Assignment of the two pathways was accomplished through analysis of femtosecond time-resolved strong-field ionization and photoion-photoion coincidence measurements carried out on methanol isotopomers, ethylene glycol, and acetone. Ab initio molecular dynamics simulations suggest the formation occurs via two steps: the initial formation of a neutral hydrogen molecule, followed by the abstraction of a proton from the remaining CHOH2+ fragment by the roaming H2 molecule. This reaction has similarities to the H2 + H2 + mechanism leading to formation of H3 + in the universe. These exotic chemical reaction mechanisms, involving roaming H2 molecules, are found to occur in the ~100 fs timescale. Roaming molecule reactions may help to explain unlikely chemical processes, involving dissociation and formation of multiple chemical bonds, occurring under strong laser fields
Mechanisms and time-resolved dynamics for trihydrogen cation (H 3 + ) formation from organic molecules in strong laser fields
Citation: Ekanayake, N., Nairat, M., Kaderiya, B., Feizollah, P., Jochim, B., Severt, T., … Dantus, M. (2017). Mechanisms and time-resolved dynamics for trihydrogen cation (H 3 + ) formation from organic molecules in strong laser fields. Scientific Reports, 7(1), 4703. https://doi.org/10.1038/s41598-017-04666-wStrong-field laser-matter interactions often lead to exotic chemical reactions. Trihydrogen cation formation from organic molecules is one such case that requires multiple bonds to break and form. We present evidence for the existence of two different reaction pathways for H3 + formation from organic molecules irradiated by a strong-field laser. Assignment of the two pathways was accomplished through analysis of femtosecond time-resolved strong-field ionization and photoion-photoion coincidence measurements carried out on methanol isotopomers, ethylene glycol, and acetone. Ab initio molecular dynamics simulations suggest the formation occurs via two steps: the initial formation of a neutral hydrogen molecule, followed by the abstraction of a proton from the remaining CHOH2+ fragment by the roaming H2 molecule. This reaction has similarities to the H2 + H2 + mechanism leading to formation of H3 + in the universe. These exotic chemical reaction mechanisms, involving roaming H2 molecules, are found to occur in the ~100 fs timescale. Roaming molecule reactions may help to explain unlikely chemical processes, involving dissociation and formation of multiple chemical bonds, occurring under strong laser fields