This data set supports the paper J, Shi et al. "All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber".

The source data of the relevant graphs in the manuscript

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

We investigated the electron-impact triple ionization and subsequent fragmentation dynamics of pyridine using multiparticle coincident momentum spectroscopy. Through the measurements of the kinetic energy release-the angle between the conjugate momenta of the first and second breakup steps and Newton diagrams for the three-body Coulomb explosion processes, we separate two distinct sequential mechanisms involving proton emission in the first or second step of sequential fragmentation. Moreover, we determine the relative ratio of the two dissociation pathways for each channel. We find that proton emission in the first step of the sequential dissociation is the dominant process (94% branching ratio) for the channel involving H migration of H+ + CH2N+ + C4H2+. It can be explained by the pyridine trication undergoing ultrafast hydrogen migration and forming a more stable α-isomeric ion, which attenuates the ring-opening reactions.

The forest biomass observation data are publicly available in refs, and the detailed information is explained in the document.

The forest biomass observation data are publicly available in refs, and the detailed information is explained in the document.

Climate change impacts microbial community structure and function, thus altering biogeochemical cycles. Biological nitrogen fixation by diazotrophs is involved in maintaining the balance of the global nitrogen cycle, but the global biogeographic patterns of diazotrophs and their responses to climate change remain unclear. In this study, we use a dataset of 1,352 potential diazotrophs by leveraging the co-occurrence of nitrogenase genes (nifHDK) and analyse the global distribution of potential diazotrophs derived from 137,672 samples. Using the random forest model, we construct a global map of diazotroph diversity, revealing spatial variations in diversity across large scales. Feature importance shows that precipitation and temperature may act as drivers of diazotroph diversity, as these factors explain 54.2% of the variation in the global distribution of diazotroph diversity. Using projections of future climate under different shared socioeconomic pathways, we show that overall diazotroph diversity could decline by 1.5% to 3.3%, with this decline further exacerbated by development patterns that increase carbon emissions. Our findings highlight the importance of sustainable development in preserving diazotrophs.

We investigated the electron-impact triple ionization and subsequent fragmentation dynamics of pyridine using multiparticle coincident momentum spectroscopy. Through the measurements of the kinetic energy release-the angle between the conjugate momenta of the first and second breakup steps and Newton diagrams for the three-body Coulomb explosion processes, we separate two distinct sequential mechanisms involving proton emission in the first or second step of sequential fragmentation. Moreover, we determine the relative ratio of the two dissociation pathways for each channel. We find that proton emission in the first step of the sequential dissociation is the dominant process (94% branching ratio) for the channel involving H migration of H+ + CH2N+ + C4H2+. It can be explained by the pyridine trication undergoing ultrafast hydrogen migration and forming a more stable α-isomeric ion, which attenuates the ring-opening reactions.

Supplementary Materials

The source data of the relevant graphs in the manuscript