Observation of anisotropic fragmentation in methane subjected to femtosecond radiation

  title={Observation of anisotropic fragmentation in methane subjected to femtosecond radiation},
  author={James Strohaber and Feng Zhu and Al. A. Kolomenskiǐ and Hans A. Schuessler},
  journal={Physical Review A},
We present experimental results on the ionization/dissociation of methane in femtosecond pulses of radiation. Angular and intensity dependent yields of singly and doubly charged species were measured using an imaging mass spectrometer. The measured data shows that all fragments yields exhibit some degree of anisotropy as a result of them being preferably ejected parallel to the polarization direction. Additionally, an anomalous perpendicular fragmentation pattern is found for CH\-(2)\+(2+). We… 

Figures from this paper

Dissociative ionization of ethane with femtosecond pulses of radiation

We present results of the interaction of ethane with 50 fs pulses of radiation at a wavelength of 800 nm. Ion yields of the parent ion and daughter fragments were measured using a reflectron

Molecular rearrangement of aniline in femtosecond radiation

In this work we investigate the interaction of aniline in the gas phase with 50 fs pulses of radiation at a wavelength of 800 nm. Ion yields were measured using a reflectron time-of-flight mass

Dissociative ionization of acetonitrile in intense femtosecond laser fields

We investigate the formation of positively charged fragments of acetonitrile (CH3CN) in intense 800 nm, 50 fs pulses of radiation using a reflectron time-of-flight (TOF) ion mass spectrometer.



Chirping-dependent ionization and dissociation of methane in an intense femtosecond laser field

We studied the ionization and dissociation of polyatomic molecule methane in an intense femtosecond laser field with wavelength of 810 nm and intensities ranging from 1.4×10^(14) to 2.6×10^(15) W/cm2

Ionization of methane in strong and ultrastrong relativistic fields.

The photoionization of methane is reported for intensities up to 10(19) W/cm2 with linear and circular polarized light, and removal of a carbon K-shell electron from methane proceeds via tunneling and rescattering ionization, without the influence of molecular channels.

Dissociation of Methane in Intense Laser Fields

The dissociation of methane in the intense laser field has been investigated experimentally and theoretically. Using an amplified ultrafast Ti:sapphire laser around 800 nm coupled to a TOF mass

The angular distributions of fragment ions from labelled and unlabelled N2O in intense laser fields

The mass spectra and angular distributions of fragment ions arising from a Coulomb explosion of highly charged parent nitrous oxide ions, obtained in the femtosecond regime (~1016 W cm-2), are

Laser-induced dissociation and explosion of methane and methanol

Femtosecond laser-field-induced dissociation and explosion of polyatomic molecules methane and methanol were experimentally investigated by using a time-of-flight mass spectrometer and a chirped

Ionization and dissociation of methane in a nanosecond laser field

The ionization and dissociation of methane in an intense laser field (approximately 1013 W cm−2) with pulse duration of 7 ns were studied experimentally. The yields of fragment ions are plotted as a

Fragmentation dynamics of methane by few-cycle femtosecond laser pulses.

The results demonstrated that the first-return recollision between the rescattered electron and the parent ion played a significant role in the fragmentation dynamics of the parent ions.

In situ measurement of three-dimensional ion densities in focused femtosecond pulses.

In situ ion imaging of spatial distributions of Xeq+ ions in the focus of a laser beam of ultrashort, intense pulses in all three dimensions allows for studying ionization processes without spatially averaging ion yields.


The nonlinear interaction of the triatomic molecules CS2 and CO2 with the intense field of a linearly polarized laser beam of femtosecond (fs) pulse duration, was used to study the ionization and

Charge-resonance-enhanced ionization of diatomic molecular ions by intense lasers.

  • ZuoBandrauk
  • Physics, Chemistry
    Physical review. A, Atomic, molecular, and optical physics
  • 1995
The ionization rate of the H{sub 2}{sup +} molecular ion in intense, short-pulse laser fields is found to exhibit maxima at large {ital R}, exceeding the atom limit by an order of magnitude.