Structure determination of alkali trimers on helium nanodroplets through laser-induced Coulomb explosion
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913219153494016 |
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| author | Kranabetter, Lorenz Kristensen, Henrik H. Schouder, Constant A. Stapelfeldt, Henrik |
| author_facet | Kranabetter, Lorenz Kristensen, Henrik H. Schouder, Constant A. Stapelfeldt, Henrik |
| contents | Alkali trimers, Ak$_3$, located on the surface of He nanodroplets are triply ionized following multiphoton absorption from an intense femtosecond laser pulse leading to fragmentation into three correlated Ak$^+$ ions. Combining the information from three-fold covariance analysis of the emission direction of the fragment ions and from their kinetic energy distributions $P(E_{\text{kin}})$, we find that Na$_3$, K$_3$, and Rb$_3$ have an equilateral triangular structure, corresponding to that of the lowest-lying quartet state $^{4}\mathrm{A}_{2}'$, and determine the equilibrium bond distance $R_\text{eq}$(Na$_3$) = 4.65 $\pm$ 0.15 Å, $R_\text{eq}$(K$_3$) = 5.03 $\pm$ 0.18 Å, and $R_\text{eq}$(Rb$_3$) = 5.45 $\pm$ 0.22 Å. For K$_3$ and Rb$_3$ these values agree well with existing theoretical calculations, while for Na$_3$ the value is 0.2-0.3 Å larger than the existing theoretical results. The discrepancy is ascribed to a minor internuclear motion of Na$_3$ during the ionization process. Also, we determine the distribution of internuclear distances $P(R)$ under the assumption of fixed bond angles. The results are compared to the square of the internuclear wave function $|Ψ(R)|^2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_00587 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structure determination of alkali trimers on helium nanodroplets through laser-induced Coulomb explosion Kranabetter, Lorenz Kristensen, Henrik H. Schouder, Constant A. Stapelfeldt, Henrik Atomic and Molecular Clusters Alkali trimers, Ak$_3$, located on the surface of He nanodroplets are triply ionized following multiphoton absorption from an intense femtosecond laser pulse leading to fragmentation into three correlated Ak$^+$ ions. Combining the information from three-fold covariance analysis of the emission direction of the fragment ions and from their kinetic energy distributions $P(E_{\text{kin}})$, we find that Na$_3$, K$_3$, and Rb$_3$ have an equilateral triangular structure, corresponding to that of the lowest-lying quartet state $^{4}\mathrm{A}_{2}'$, and determine the equilibrium bond distance $R_\text{eq}$(Na$_3$) = 4.65 $\pm$ 0.15 Å, $R_\text{eq}$(K$_3$) = 5.03 $\pm$ 0.18 Å, and $R_\text{eq}$(Rb$_3$) = 5.45 $\pm$ 0.22 Å. For K$_3$ and Rb$_3$ these values agree well with existing theoretical calculations, while for Na$_3$ the value is 0.2-0.3 Å larger than the existing theoretical results. The discrepancy is ascribed to a minor internuclear motion of Na$_3$ during the ionization process. Also, we determine the distribution of internuclear distances $P(R)$ under the assumption of fixed bond angles. The results are compared to the square of the internuclear wave function $|Ψ(R)|^2$. |
| title | Structure determination of alkali trimers on helium nanodroplets through laser-induced Coulomb explosion |
| topic | Atomic and Molecular Clusters |
| url | https://arxiv.org/abs/2402.00587 |