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Laser-induced electron diffraction of the ultrafast umbrella motion in ammonia
Structural Dynamics ( IF 3.670 ) Pub Date : 2021-01-13 , DOI: 10.1063/4.0000046 B Belsa 1 , K Amini , X Liu 1 , A Sanchez 1 , T Steinle 1 , J Steinmetzer 2 , A T Le 3 , R Moshammer 4 , T Pfeifer 4 , J Ullrich , R Moszynski 5 , C D Lin 6 , S Gräfe 2 , J Biegert
Structural Dynamics ( IF 3.670 ) Pub Date : 2021-01-13 , DOI: 10.1063/4.0000046 B Belsa 1 , K Amini , X Liu 1 , A Sanchez 1 , T Steinle 1 , J Steinmetzer 2 , A T Le 3 , R Moshammer 4 , T Pfeifer 4 , J Ullrich , R Moszynski 5 , C D Lin 6 , S Gräfe 2 , J Biegert
Affiliation
Visualizing molecular transformations in real-time requires a structural retrieval method with Ångström spatial and femtosecond temporal atomic resolution. Imaging of hydrogen-containing molecules additionally requires an imaging method sensitive to the atomic positions of hydrogen nuclei, with most methods possessing relatively low sensitivity to hydrogen scattering. Laser-induced electron diffraction (LIED) is a table-top technique that can image ultrafast structural changes of gas-phase polyatomic molecules with sub-Ångström and femtosecond spatiotemporal resolution together with relatively high sensitivity to hydrogen scattering. Here, we image the umbrella motion of an isolated ammonia molecule (NH3) following its strong-field ionization. Upon ionization of a neutral ammonia molecule, the ammonia cation (NH3+) undergoes an ultrafast geometrical transformation from a pyramidal () to planar () structure in approximately 8 femtoseconds. Using LIED, we retrieve a near-planar () field-dressed NH3+ molecular structure femtoseconds after ionization. Our measured field-dressed NH3+ structure is in excellent agreement with our calculated equilibrium field-dressed structure using quantum chemical ab initio calculations.
更新日期：2021-03-01
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