言外之意
发表于 2025-3-25 05:48:58
,Positive-Ion—Molecule Reaction Studies in a Single Electron-Impact Source, along the path of the electron beam. A small, positive potential is normally applied to the repeller and causes the ions to drift toward the exit slit and into the ion gun and the analyzer. A typical source is shown in Fig. 1. Under ordinary operating conditions, the pressure in the ion source is o
hemophilia
发表于 2025-3-25 11:02:45
Ion-Molecule Reactions by Photoionization Techniques,veral years photoionization techniques have been applied to this area of research. The experimental techniques of photoionization are generally more difficult to apply than those of electron impact, but have certain strong advantages in the ability to provide more precisely characterized preparation
annexation
发表于 2025-3-25 11:58:20
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分贝
发表于 2025-3-25 17:48:31
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优雅
发表于 2025-3-25 20:32:23
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敬礼
发表于 2025-3-26 00:42:45
,Higher-Order Reactions—Ion Clusters and Ion Solvation,t pressures above 1 Torr. Many of the phenomena encountered in this pressure range have significance beyond the study of ion clusters. Some such features of general importance to ion-molecule reactions at elevated pressures are also included in the discussion.
BRACE
发表于 2025-3-26 07:10:11
tigate the use of Internet for health-related purposes among Polish elderly, the frequency and reasons of use, the importance of e-health services, and factors affecting their use. A total of 242 elderly at the age of ≥60 years were selected from the Polish population by random sampling. Data collec
小官
发表于 2025-3-26 10:49:21
J. L. Franklining significant effects on planet and obviously on all living species so that public concern about the impact of EDCs is constantly growing..Moreover, there are many contaminants in the environment which have never been examined. Even low-level exposure to these chemicals can have significant effect
Sinus-Node
发表于 2025-3-26 16:40:25
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胆大
发表于 2025-3-26 19:28:03
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