Two-particle interference of electron pairs on a molecular level

We investigate the photo-doubleionization of $H_2$ molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in their angular emission distributions if considered separately. In contrast, the quasi-particle consisting of both electrons (i.e. the "dielectron") does. The work highlights the fact that non-local effects are embedded everywhere in nature where many-particle processes are involved

PS-278 Automated Versus Manual Fio2 Control At Different Saturation Targets In Preterm Infants

Background Preterm infants spend only 50% of time within the target oxygen saturation (SpO2) during manual FiO2 control (M-FiO2). Automated FiO2 control (A-FiO2) improves SpO2 targeting but it is uncertain if this applies to different SpO2 target ranges and during non-invasive support (NIVS) and mechanical ventilation (MV). Objective To compare the efficacy of A-FiO2 vs M-FiO2 in keeping two different SpO2 targets during NIVS or MV. Design/methods Preterm infants on FiO2 >0.21 receiving NIVS or MV were randomised to SpO2 targets 89–93% or 91–95% and underwent M-FiO2 and A-FiO2 for 24 h each, in random sequence. Results 80 infants (GA:26 w, age:18 d) were included (NIVS = 48, MV = 32). Time within target increased and below target decreased during A-FiO2 compared with M-FiO2, especially in the lower target range. There was a reduction in time and hypoxemia episodes with SpO2 target 21 (13) 25 (10)* 22 (13) 19 (8) %-time 98% 0.2 (0.0–0.8) 0.7 (0.1–1.6)* 0.7 (0.2–2.1) 1.7 (0.7–4.3) %-time SpO2 1 min/24 h 4 (1–12) 15 (5–24)* 4 (1–11) 13 (3–24)* Manual FiO2 adjustments/24h 1 (0–3) 102 (72–173)* 1 (0–3) 109 (79–156)* * p < 0.0

Imaging the structure of the trimer systems ⁴He₃ and ³He⁴He₂

Helium shows fascinating quantum phenomena unseen in any other element. In its liquid phase, it is the only known superfluid. The smallest aggregates of helium, the dimer (He2) and the trimer (He3) are, in their predicted structure, unique natural quantum objects. While one might intuitively expect the structure of 4He3 to be an equilateral triangle, a manifold of predictions on its shape have yielded an ongoing dispute for more than 20 years. These predictions range from 4He3 being mainly linear to being mainly an equilateral triangle. Here we show experimental images of the wave functions of 4He3 and 3He4He2 obtained by Coulomb explosion imaging of mass-selected clusters. We propose that 4He3 is a structureless random cloud and that 3He4He2 exists as a quantum halo state