Multiphoton Ionization and Dissociation of Nitromethane Using Femtosecond Laser Pulses at 375 and 750 nm

Kılıç, Hamdi Şükür; Ledingham, K. W. D.; Kosmidis, C.; McCanny, T.; Singhal, R.P.; Wang, S. L.; Smith, D. J.; Langley, and A. J.; Shaikh, W.

doi:10.1021/jp962495d

Cited by 65 publications

(79 citation statements)

References 46 publications

(100 reference statements)

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“…However, the temporal width of the pulse allows for some geometry changes and the Franck-Condon constraint is somewhat relaxed. Kilic et al [92] have observed single-color multiphoton ionization of nitromethane at 375 nm. Their experiment (with a slightly shorter pulse of 90 fs) showed a TOF mass spectrum comparable to our TOF spectrum shown in Figure 7, although in ref.…”

Section: à2mentioning

confidence: 99%

The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics

et al. 2011

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Herein, we review the current capabilities and potential of advanced single-particle imaging techniques to study photodynamics in isolated molecules. These reaction microscopes are able to measure the full three-dimensional energy and angular distribution of (correlated) particles such as electrons and molecular fragments ejected after photoexcitation of molecules. In particular, we discuss the performance and capabilities of a novel photoelectron-photoion coincidence imaging spectrometer constructed at LaserLaB Amsterdam. This microscope was developed for the study of nonadiabatic effects in ultrafast time-resolved experiments. It is specifically targeted at optimal control studies of photodynamics to foster and advance our understanding of mechanisms in optimal control with shaped ultrafast laser pulses. We review a few recent experimental results illustrating the wealth of detailed information that can be obtained in such imaging experiments about the interplay between (shaped) laser fields, molecular dynamics, ionization processes and competing multichannel pathways. Furthermore, the recently developed photoelectron-circular-dichroism imaging technique to detect enantiomers and to study chirality effects will be discussed, as a further illustration of the potential of modern reaction microscopes in stereochemistry.

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Section: à2mentioning

confidence: 99%

The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics

et al. 2011

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“…The electron in the highest occupied molecular orbit tunnels through the barrier, which leads to field ionization of the molecules [20,21], a type of soft ionization. The intense 800 nm fs laser can ionize all molecules and the parent ion is dominant, even for labile molecules [22][23][24][25][26][27]. The advantages of FLMS and its possible applications have been summarized in the review article [22].…”

Section: Principlementioning

confidence: 99%

Application of femtosecond laser mass spectrometry to the analysis of volatile organic compounds

Liu

et al. 2010

J. Am. Soc. Mass Spectrom.

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Femtosecond (fs) lasers have high intensity and ultrashort pulse duration. Tunneling ionization occurs for molecules subject to such intense laser fields. We have studied the mass spectra of a variety of molecules irradiated by intense fs laser pulses. These molecules include some typical volatile organic compounds contained in human breath and in the atmosphere. The results demonstrate that all of these molecules can be ionized by intense fs laser pulses. Dominant parent ion and some characteristic ionic fragments are observed for each molecule. The degree of fragmentation can be controlled by adjusting the laser intensity. Moreover, saturation ionization can occur for each molecule by increasing the laser intensity. These features indicate that fs laser mass spectrometry can be a sensitive tool to identify and quantify volatile

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“…This could account for the efficient ionization and intact parent ion production as reported in many femtosecond mass spectrometry works. [10][11][12] Nevertheless, at the same time it is probable that the adiabatic potential surfaces can cross each other and nonadiabatic transitions between them can take place. The latter can result in the opening of various dissociation channels ("ladder switching").…”

Section: Introductionmentioning

confidence: 99%

Interaction Mechanism of Some Alkyl Iodides with Femtosecond Laser Pulses

et al. 2005

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The interaction of 1-iodopropane, 2-iodopropane, 1-iodobutane, 2-iodobutane, and 1-iodopentane with (5 × 10 13-5 × 10 15 W/cm 2 ) femtosecond laser fields is studied by means of a time-of-flight mass spectrometer. It is found that multiphoton ionization (MPI) and field ionization (FI) processes are involved in the molecular ionization. The contribution of these processes can be distinguished using the peak profile of the ions in the mass spectra. Thus, from the mass spectra of 2-iodoropane and 2-iodobutane, it is concluded that MPI processes are taking place even for Keldysh parameter values γ ∼ 0.3. The field ionization process depends on the characteristics of the molecular binding potential well and leads to an asymmetric charge distribution of the transient multiply charged parent ions. In the case of 1-iodobutane, the MPI processes lead to a stable doubly charged parent ion production with a laser intensity threshold higher than that found for I 2+ ions. In addition, the isomers studied exhibit distinct differences in their mass spectra and their origin is discussed in detail.

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Multiphoton Ionization and Dissociation of Nitromethane Using Femtosecond Laser Pulses at 375 and 750 nm

Cited by 65 publications

References 46 publications

The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics

The Reaction Microscope: Imaging and Pulse Shaping Control in Photodynamics

Application of femtosecond laser mass spectrometry to the analysis of volatile organic compounds

Interaction Mechanism of Some Alkyl Iodides with Femtosecond Laser Pulses

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