Specificity of scattering of ultrashort laser pulses by molecules with polyatomic structure

Abstract

The theory of scattering of ultrashort laser pulses (USP) is the basis of diffraction analysis of matter using modern USP sources. At present, the peculiarities of interaction of USP with complex structures are not well developed. In general, the research focuses on the features of the interaction of USP with simple systems, these are atoms and simple molecules. Here we present a theory of scattering of ultrashort laser pulses on molecules with a multi-atomic structure, taking into account the specifics of the interaction of USP with such a substance. The simplicity of the obtained expressions allows them to be used in diffraction analysis. As an example, the scattering spectra of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are presented. It is shown that the theory developed here is more general in the scattering theory and passes into the previously known one if we consider the duration of the USP to be sufficiently long.

Scattering of Ultrashort X-Ray Pulses on Diamonds with NV Centers

“…( 3) we obtained two important results. The first result is responsible for the necessity to use the theory of USP scattering on complex multi-atomic systems developed in this work and in [24,25] in the case of using attosecond pulses. We have shown that when using attosecond pulses, the previously well known XRD theory can carry significant errors and it is necessary to use the theory developed here.…”

“…If in this expression we take into account only the coherent USP scattering term (the second sum in Eq. ( 3)) and we take τ → ∞ away, we obtain the well-known expression for the scattering of long duration (monochromatic) X-rays [25]. Indeed, at τ → ∞ the expressions for p τ = 1 cτ (n − n 0 ) → 0 and Eq.…”

“…We will consider the USP fields not so strong as to account for the magnetic field of the USP, i.e., we will assume that E 0 /c 2 1 or in intensity units I 10 25 W/sm 2 . In this case, as was shown in [24,25], the scattering spectra (scattered energy USP to a unit solid angle in a unit frequency interval) can be represented as…”

“…The femto-and especially attosecond time-resolved scattering processes on such structures have not been well studied and are being actively developed nowadays [8,[13][14][15][16][17][18][19][20][21][22][23]. It has recently been shown that the scattering of attosecond USPs on DNA nucleotides may differ significantly from the previously known XRD theory [24,25]. Thus, the study of USP scattering on diamond with NV centres, taking into account the specificity of their scattering, is an important task.…”

Scattering of Ultrashort Laser Pulses on DNA and RNA Trinucleotides

“…We will consider the USP as spatially inhomogeneous, i.e. the USP 85 electromagnetic field strength should be chosen as E(r, t) = E 0 h(t − n 0 r/c), where E 0 is 86 the field amplitude, h(t − n 0 r/c) is the arbitrary function defining the USP shape, c is energy USPs per unit solid angle in the unit frequency interval) can be represented as 92 [18,19,27,28] 93…”