Photodissociation of Benzotrifluoride at 193 nm

Tsai, Shang‐Ting; Lee, Yuan T.; Ni, Chi-Kung

doi:10.1021/jp000790z

Cited by 11 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental technique has been described in detail in our previous reports on other aromatic molecules. 11 Only a brief description is given here. Nitrobenzene ͑or o-nitrotoluene͒ vapor was formed by flowing ultrapure He at pressures of 800 ͑or 500͒ Torr through a reservoir filled with a sample at 350 ͑or 330͒ K. The sample/He mixture was then expanded through a 500 m pulsed nozzle to form the molecular beam.…”

Section: Methodsmentioning

confidence: 99%

Photodissociation dynamics of nitrobenzene and o-nitrotoluene

Lin

Lee

et al. 2007

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

Photodissociation of nitrobenzene at 193, 248, and 266 nm and o-nitrotoluene at 193 and 248 nm was investigated separately using multimass ion imaging techniques. Fragments corresponding to NO and NO(2) elimination from both nitrobenzene and o-nitrotoluene were observed. The translational energy distributions for the NO elimination channel show bimodal distributions, indicating two dissociation mechanisms involved in the dissociation process. The branching ratios between NO and NO(2) elimination channels were determined to be NONO(2)=0.32+/-0.12 (193 nm), 0.26+/-0.12 (248 nm), and 0.4+/-0.12(266 nm) for nitrobenzene and 0.42+/-0.12(193 nm) and 0.3+/-0.12 (248 nm) for o-nitrotoluene. Additional dissociation channels, O atom elimination from nitrobenzene, and OH elimination from o-nitrotoluene, were observed. New dissociation mechanisms were proposed, and the results are compared with potential energy surfaces obtained from ab initio calculations. Observed absorption bands of photodissociation are assigned by the assistance of the ab initio calculations for the relative energies of the triplet excited states and the vertical excitation energies of the singlet and triplet excited states of nitrobenzene and o-nitrotoluene. Finally, the dissociation rates and lifetimes of photodissociation of nitrobenzene and o-nitrotoluene were predicted and compared to experimental results.

show abstract

Section: Methodsmentioning

confidence: 99%

Photodissociation dynamics of nitrobenzene and o-nitrotoluene

Lin

Lee

et al. 2007

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Another approach is to measure the disappearance rate of the parent molecules, that is, the intensity change of the disk-like images at various delay times along the molecular beam. 13,21 In addition to these methods, the dissociation rate can also be obtained from the line-shape image intensity distribution. Since the intensity of the lineshape image results from the accumulation of the products produced during the time period from the pump pulse to the probe pulse, the ion image intensity distribution is a function of both the fragment recoil velocity distribution and the dissociation rate.…”

Section: Methodsmentioning

confidence: 99%

Photodissociation of ethylbenzene and n-propylbenzene in a molecular beam

Huang

Jiang

Lee

et al. 2002

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

The photodissociation of jet-cooled ethylbenzene and n-propylbenzene at both 193 and 248 nm was studied using vacuum ultraviolet photoionization/multimass ion imaging techniques. The photofragment translational energy distributions from both the molecules obtained at 193 nm show that the probability of portioning energy to product translational energy decreases monotonically with increasing translational energy. They indicate that the dissociation occurs from the ground electronic state. However, the photofragment translational energy distributions from both molecules obtained at 248 nm contain a fast and a slow component. 75% of ethylbenzene and 80% of n-propylbenzene following the 248 nm photoexcitation dissociate from electronic excited state, resulting in the fast component. The remaining 25% of ethylbenzene and 20% of n-propylbenzene dissociate through the ground electronic state, giving rise to the slow component. A comparison with an ab initio calculation suggests that the dissociation from the first triplet state corresponds to the fast component in translational energy distribution.

show abstract

“…Experimentally, the photodissociation dynamics of aryl halides have widely been studied in the gas phase by photofragment translational spectroscopy (PTS) [50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65], in real time by ultrafast pump-probe spectroscopy combined with timeof-flight (TOF) [66][67][68][69][70][71], by time-resolved Fourier-transform spectroscopy [35,71,72], by resonance enhanced multiphoton ionization (REMPI) technique [73][74][75][76], and by multimass ion imaging techniques [36,48,49,[77][78][79][80]. Fox example, Bersohn and coworkers [50,51] were firstly to study the photodissociation dynamics of the aryl halides at 193 and 248 nm.…”

Section: Introductionmentioning

confidence: 99%