Summary
This review article, "The Physics of Semiconductor Surfaces," by Walter Houser Brattain, focuses on the physical properties of semiconductor surfaces. It addresses concepts related to electrical charge, particularly concerning the behavior of electrons and ions in the atmosphere, which is relevant to understanding surface phenomena. The article examines how energy impacts atomic structure, leading to ionization, and how external factors like solar radiation and atmospheric density influence the presence of charged particles in regions like the ionosphere. It also touches upon the process of recombination where ions and electrons rejoin.
The text explores the formation of ions through collisions or radiation, and the resulting charged states of atoms. It differentiates between the low ionization in the lower atmosphere due to recombination and the higher ionization in the thin upper atmosphere. The article identifies specific layers within the atmosphere, such as the F layer, F1, and F2, based on their ionization levels and altitudes above the Earth's surface, and notes how these levels fluctuate with the time of day and season.
Key concepts
- Ion — An atom or group of atoms that has become electrically charged by losing or gaining electrons.
- Ionosphere — A region of the upper atmosphere characterized by a large number of positive and negative ions and unattached electrons.
- Ionization — The process by which an atom or molecule loses or gains electrons, acquiring an electrical charge.
- Recombination — The process by which ions and electrons rejoin, decreasing the overall ionization of a region.
- F layer — A region in the outermost atmosphere with low density and intense ionization from solar radiation.
- F1 and F2 layers — Specific levels of maximum F ionization in the atmosphere, located at approximately 90 and 125 statute miles above the Earth's surface, respectively.
Popular questions readers ask
- How does the comprehensive organization of "The American Practical Navigator" into distinct parts (e.g., Fundamentals, Piloting, Electronic, Celestial) not only reflect the diverse knowledge required for navigation but also hint at how these different methods might complement or substitute each other under varying circumstances?
- If you were explaining the core purpose of "The American Practical Navigator" to someone unfamiliar with maritime travel, how would you simplify the distinction between "Piloting" and "Celestial Navigation," and what essential piece of equipment would be central to each?
- Considering Nathaniel Bowditch lived long before the advent of electronic navigation, which parts of the 2002 Table of Contents would have been completely foreign to him, and what does this evolution suggest about the continuous adaptation required in the field of navigation?
- The text notes "The American Practical Navigator" is in the public domain due to being a U.S. government work. How might this public accessibility foster innovation or standardization in navigation, compared to if it were a proprietary text?
- Imagine you are teaching a new navigator. Based on the sequence of topics in the Table of Contents, what logical progression of skills and knowledge does the book implicitly suggest a mariner should master, and why might this order be particularly effective for practical learning?