Wavelength- and alignment-dependent photoionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">N</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Petretti, Simon; Magana, Alvaro; Sáenz, Alejandro; Decleva, Piero

doi:10.1103/physreva.94.053411

Cited by 5 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deconvoluted MF ionization probability distributions I(θ) of N 2 are shown in green using q á ¢ñ = cos 0.55 2 (dashed), 0.60 (solid) and 0.65 (dotted). With a 800nm probe and I probe =1.0× 10 14 W cm −2 , the ∼3:1 ratio between parallel to perpendicular alignment is consistent with previous studies and reflects the σ g symmetry of the highest occupied molecular orbital (HOMO) of N 2  [27,[36][37][38]. The small local maximum of ionization featured at θ=90°is real as it was also reported elsewhere at lower intensity (I probe =3.0×10 13 W cm −2 ) via COLTRIMS measurements [39].…”

Section: Strong Field Ionization In Aligned Moleculessupporting

confidence: 89%

Simultaneous measurements of strong-field ionization and high harmonic generation in aligned molecules

Marceau

Bertrand

Peng

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

High harmonic spectroscopy relies on high harmonic generation (HHG) in aligned molecules. The first step of HHG is the ionization of the molecule in the intense femtosecond laser field.Here we present measurements of both ionization yield and high harmonic yield as a function of molecular angle in N 2 and CO 2 molecules. Measurements were done at two wavelengths, 800 and 1200nm, and for a range of laser intensities, to study the sensitivity of laser conditions on both processes. The behavior of N 2 was relatively insensitive to laser conditions. However in CO 2 , a minimum in high harmonic emission was observed that was sensitive to both laser intensity and wavelength, and was attributed to interference in emission from the HOMO and HOMO-2 orbitals.

show abstract

Section: Strong Field Ionization In Aligned Moleculessupporting

confidence: 89%

Simultaneous measurements of strong-field ionization and high harmonic generation in aligned molecules

Marceau

Bertrand

Peng

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

“…An increase of the HOMO ionization probability for the wavelength change from 500 to 600 nm is also displayed. This irregular behaviour of the HOMO ionization probability will be analyzed in figure 2.The TDSE simulations for the intense-field ionization spectrum of N 2 and O 2 [44] have emphasized an overall decrease of the ionization yields with increasing laser wavelength. Figure 2 displays the time dependence of the laser electric field given by equations ( 11) and (12) in upper panels and the corresponding orbital populations in lower panels, for the three wavelengths for which the HOMO ionization probability presents an irregular behaviour for short laser pulses, as can be seen from figure 1(a).…”

Section: Resultsmentioning

confidence: 94%

Multiorbital effects on CO ionization by intense short laser pulses

Stroe

Fifirig

2021

Phys. Scr.

View full text Add to dashboard Cite

Within time-dependent Hartree–Fock theory, we study the CO ionization for six different photon wavelengths running from 200 to 700 nm. The parallel and perpendicular alignments of the CO molecular axis with the polarization direction of the laser electric field are considered for two different laser intensities, namely and W cm−2. At the laser intensity W cm−2, the ionization picture is characterized by the dominance of the highest occupied molecular orbital, while at laser intensity W cm−2 the inner valence molecular orbitals significantly contribute to the CO ionization. The present computations also reveal that orbital switching effects due to peak intensity variation may occur at some shorter wavelengths.

show abstract

Hindered alignment in ultrashort, intense laser-induced fragmentation of O2

Sen

Sairam

Sahu

et al. 2020

The Journal of Chemical Physics

View full text Add to dashboard Cite

Molecules ionized by intense (10–100 TW/cm2) and ultrashort (tens of femtoseconds) laser fields undergo rotation and alignment mediated through their polarizability. The expected alignment is indeed observed in the case of O2 molecules ionized by intense laser pulses of 800 nm wavelength and 25 fs duration, as observed through velocity imaging of the fragments. Strikingly, when 35 fs pulses of 400 nm wavelength of comparable intensity are employed, an anomalous hindering of this alignment is observed. In both cases, we propose dissociation pathways for the energetic ions consistent with the recorded kinetic energy distributions. Using a semiclassical model of induced rotation of the molecular ion that involves polarizabilities of the participating excited states, both behaviors are reproduced. The model suggests that the difference in the observations can be attributed to a transient negative polarizability in an intermediate state of the proposed pathway.

show abstract

Wavelength- and alignment-dependent photoionization ofN2andO2

Cited by 5 publications

References 21 publications

Simultaneous measurements of strong-field ionization and high harmonic generation in aligned molecules

Simultaneous measurements of strong-field ionization and high harmonic generation in aligned molecules

Multiorbital effects on CO ionization by intense short laser pulses

Hindered alignment in ultrashort, intense laser-induced fragmentation of O2

Contact Info

Product

Resources

About