Találati lista | Tudóstér

001-es BibID:	BIBFORM107593
035-os BibID:	(Scopus)85132360125 (WOS)000798866500001
Első szerző:	Biró László (fizikus)
Cím:	Tracing the vibrational dynamics of sodium iodide via the spectrum of emitted photofragments / László Biró, András Csehi
Dátum:	2022
ISSN:	1463-9076 1463-9084
Megjegyzések:	We study by real-time wave packet simulations the ultrafast photodissociation dynamics of the sodium iodide molecule with the aim to trace molecular vibrational motion in a bound electronic state. Applying a few-cycle infrared pump laser pulse, a nuclear wave packet is created in the ground electronic state via the dynamic Stark shift of the potential energy curves of the molecule. To probe this coherent motion in the ground state, we propose to use a series of ultrashort laser pulses with different photon energies that resonantly promote the spread-out wave packet to the repulsive excited state. As the kinetic energy release (KER) spectrum of the dissociating photofragments is sensitive to the shape of the vibrational wave packet, in our pump-probe scheme, KER-delay spectrograms generated for different probe photon energies are used to monitor the molecular motion in the bound state. In our numerical analysis supported by a simple analytical model, we show that for sufficiently long probe pulses the proposed mapping scheme reaches its limits as nuclear wave packet interferences wash out the observed images. The appearance of these interferences is attributed to nuclear wave packet amplitudes that are generated at the first and second half of the probe pulse with the same energy but with a certain time delay. In our detailed numerical survey on the laser parameter dependence of the presented scheme, we find that resonant probe pulses with a few femtosecond duration are suitable for a qualitative mapping of the bound-state molecular motion.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk vibrációs dinamika lézerszabályozás
Megjelenés:	Physical Chemistry Chemical Physics. - 24 : 21 (2022), p. 13234-13244. -
További szerzők:	Csehi András (1986-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM118790
035-os BibID:	(WoS)001160720400001 (Scopus)85185244403
Első szerző:	Umarov, Otabek
Cím:	Light-induced photodissociation in the lowest three electronic states of the NaH molecule / Otabek Umarov, András Csehi, Péter Badankó, Gábor J. Halász, Ágnes Vibók
Dátum:	2024
ISSN:	1463-9076 1463-9084
Megjegyzések:	It has been known that electronic conical intersections in a molecular system can also be created by laser light even in diatomics. The direct consequence of these light-induced degeneracies is the appearance of a strong mixing between the electronic and vibrational motions, which has a strong fingerprint on the ultrafast nuclear dynamics. In the present work, pump and probe numerical simulations are performed with the NaH molecule involving the first three singlet electronic states (X1 sigma+(X), A1 sigma+(A) and B1 pi(B)) and several light-induced degeneracies in the numerical description. To demonstrate the impact of the multiple light-induced non-adiabatic effects together with the molecular rotation on the dynamical properties of the molecule, the dissociation probabilities, kinetic energy release spectra (KER) and the angular distributions of the photofragments were calculated by discussing the role of the permanent dipole moment as well.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk non-adiabatic coupling conical intersection nuclear dynamics intense laser field permanent dipole moment
Megjelenés:	Physical Chemistry Chemical Physics. - 26 (2024), p. 7211-7223. -
További szerzők:	Csehi András (1986-) (fizikus) Badankó Péter (1989-) (fizikus) Halász Gábor J. (1961-) (fizikus) Vibók Ágnes (1962-) (fizikus)
Pályázati támogatás:	K 146096 Egyéb BO/00474/22/11 Egyéb ÚNKP-23-5 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: