Abstract
Isomerization and carbon chemistry in the gas phase are key processes in many scientific studies. Here we report on the isomerization process from linear {{rm C}}_{10}^ - to its monocyclic isomer. {{rm C}}_{10}^ - ions were trapped in an electrostatic ion beam trap and then excited with a laser pulse of precise energy. The neutral products formed upon photoexcitation were measured as a function of time after the laser pulse. It was found using a statistical model that, although the system is excited above its isomerization barrier energy, the actual isomerization from linear to monocyclic conformation takes place on a very long time scale of up to hundreds of microseconds. This finding may indicate a general phenomenon that can affect the interstellar medium chemistry of large molecule formation as well as other gas phase processes.
Highlights
Isomerization and carbon chemistry in the gas phase are key processes in many scientific studies
The correction factors for all the rate coefficients were set to unity except for fRF which was set to 0.8 so that the calculated neutralization rates best match our experimental results
As expected for these photon energies, we observed that vibrational autodetachment (VAD) directly from linear CÀ10 does not contribute to the one-photon neutralization rate, i.e., R1ðtÞ = Riso[1] ðtÞ, and it is this neutralization pathway that occurs over an unusually long time of up to hundreds of microseconds
Summary
Isomerization and carbon chemistry in the gas phase are key processes in many scientific studies. The neutral products formed upon photoexcitation were measured as a function of time after the laser pulse It was found using a statistical model that, the system is excited above its isomerization barrier energy, the actual isomerization from linear to monocyclic conformation takes place on a very long time scale of up to hundreds of microseconds. This finding may indicate a general phenomenon that can affect the interstellar medium chemistry of large molecule formation as well as other gas phase processes. Our results on isomerization from linear to Oscillating ions
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