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Ionization Energy03:12

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The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
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Phase-dependent ionization of hydrogen by intense sub-cycle pulses.

J T Karpel, D D Yavuz

    Optics Letters
    |June 2, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Intense, ultrashort laser pulses show surprising carrier-envelope phase dependence in hydrogen atom ionization. Sine-like pulses ionize more than cosine-like pulses, defying tunneling ionization models.

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    Area of Science:

    • Atomic Physics
    • Quantum Mechanics
    • Laser-Matter Interactions

    Background:

    • Understanding electron behavior in intense laser fields is crucial for fields like attosecond science.
    • The carrier-envelope phase (CEP) of laser pulses influences electron dynamics.
    • Previous models often assume tunneling ionization, dependent on peak field amplitude.

    Purpose of the Study:

    • To investigate the carrier-envelope phase (CEP) dependence of hydrogen atom ionization.
    • To explore ionization dynamics with intense, sub-femtosecond laser pulses.
    • To compare simulation and analytical results with existing ionization models.

    Main Methods:

    • Performed computational simulations of atomic ionization.
    • Conducted analytical calculations to model the process.
    • Utilized intense, sub-cycle, sub-femtosecond laser pulses in the models.

    Main Results:

    • Demonstrated strong carrier-envelope phase dependence in hydrogen ionization.
    • Observed that sine-like pulses ionize more than cosine-like pulses for the same pulse energy.
    • Found this behavior contradicts predictions from standard tunneling ionization models.

    Conclusions:

    • The ionization of hydrogen atoms by ultrashort laser pulses is highly sensitive to the carrier-envelope phase.
    • Classical orbit time effects become significant for sub-femtosecond pulses, altering ionization pathways.
    • Results necessitate a re-evaluation of ionization models for extreme ultraviolet laser-matter interactions.