Relaxation Dynamics of Naphthalene and 1-Aminonaphthalene in Superexcited States

Montero, Raúl; Castaño, Fernando; Martı́nez, Roberto; Longarte, Asier

doi:10.1021/jp8056064

Cited by 13 publications

(24 citation statements)

References 35 publications

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“…Clearly, it cannot be attributed to background signal produced by two pump‐photon absorption, because in this case, it would also be observed at positive delay times. A signal at negative delay times has been reported for several aromatic molecules, for which two possible explanations were given: 1) dynamics of states excited by the probe beam (inverse pump‐probe process) and 2) two‐photon absorption by the pump beam; this causes excitation at superexcited neutral states and/or ionization, with subsequent dissociation caused by the probe beam, which thus leads to depletion of the baseline. The latter case would contaminate the processes under investigation, whereas the former would not affect them significantly, as the decay would occur towards the negative delay times.…”

Section: Resultsmentioning

confidence: 99%

On the Dynamics of Xylene Isomers Excited in the Vacuum‐Ultraviolet (VUV) Region

2016

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We report on the dynamics of electronically excited o-, m-, and p-xylene on the femtosecond timescale by employing the vacuum-ultraviolet pump-IR probe mass spectrometry technique. The molecules were excited by the fifth harmonic (λ=160 nm) of a Ti:sapphire laser at a superposition of the S3 valence with several Rydberg states. The relaxation pathways were investigated by studying the parent P(+) and the fragment [P-H](+) and [P-CH3 ](+) time-resolved signals generated after interaction with the fundamental beam (λ=800 nm). Relaxation from the excited valence states was found to depend on the relative positions of the methyl groups on the ring. An increasing trend in the order o

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Section: Resultsmentioning

confidence: 99%

On the Dynamics of Xylene Isomers Excited in the Vacuum‐Ultraviolet (VUV) Region

2016

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“…The intensities of pump pulses at the ionization region were optimized to avoid saturation effects and contributions from higher excited states. 43 The probe beams intensities were estimated to be, (1.4-2) × 10 10 , (0.7-1) × 10 11 , and (3.5-6) × 10 11 W/cm 2 for the 400, 800, and 1305 nm probe beams. The relative polarization was set at magic angle, except for the polarization anisotropy measurements.…”

Section: Methodsmentioning

confidence: 95%

Ultrafast dynamics of aniline in the 294-234 nm excitation range: The role of the πσ* state

Montero

Conde

Ovejas

et al. 2011

The Journal of Chemical Physics

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The ultrafast relaxation of jet-cooled aniline was followed by time-resolved ionization, after excitation in the 294-234 interval. The studied range of energy covers the absorption of the two bright ππ∗ excitations, S(1) and S(3), and the almost dark S(2) (πσ∗) state. The employed probe wavelengths permit to identify different ultrafast time constants related with the coupling of the involved electronic surfaces. A τ(1) = 165 ± 30 fs lifetime is attributed to dynamics along the S(2) (πσ∗) repulsive surface. Other relaxation channels as the S(1)→S(0) and S(3)→S(1) internal conversion are also identified and characterized. The work provides a general view of the photophysics of aniline, particularly regarding the role of the πσ∗ state. This state appears as minor dissipation process due to the ineffective coupling with the bright S(1) and S(3) states, being the S(1)→S(0) internal conversion the main non-radiative process in the full studied energy range. Additionally, the influence of the off-resonance adiabatic excitation of higher energy electronic states, particularly S(3), is also observed and discussed.

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“…The experimental method and apparatus have already been described elsewhere 33 and only a brief description is included in this section.…”

Section: Experimental Methodsmentioning

confidence: 99%

Femtosecond time-resolved photophysics and photodissociation dynamics of 1-iodonaphthalene

Montero

Conde

Longarte

et al. 2010

Phys. Chem. Chem. Phys.

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The ultrafast relaxation of 1-iodonaphthalene, with particular attention to the dissociation channels, has been studied by time-resolved femtosecond pump-probe mass spectrometry following excitation at 267 and 317 nm. The measured transients for the parent ion and the isobaric fragments, iodine and naphthyl radical, show complex decay profiles with up to four lifetimes in the femto-picosecond time scales. The transients are interpreted as the result of parallel relaxation of the simultaneously excited n sigma* and pi pi* states of the molecule. While the former leads to dissociation in about 400 fs, the latter converts to lower energy pi pi* singlet states at an ultrafast rate (24 fs) followed by intersystem crossing to nearby pi pi* triplet states.

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Relaxation Dynamics of Naphthalene and 1-Aminonaphthalene in Superexcited States

Cited by 13 publications

References 35 publications

On the Dynamics of Xylene Isomers Excited in the Vacuum‐Ultraviolet (VUV) Region

On the Dynamics of Xylene Isomers Excited in the Vacuum‐Ultraviolet (VUV) Region

Ultrafast dynamics of aniline in the 294-234 nm excitation range: The role of the πσ* state

Femtosecond time-resolved photophysics and photodissociation dynamics of 1-iodonaphthalene

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