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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
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SN1 Reaction: Kinetics02:05

SN1 Reaction: Kinetics

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In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...
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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
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Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
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Optical athermalization in the visible waveband using the 1+∑ method.

Na Xie, Qingfeng Cui, Lin Sun

    Applied Optics
    |January 30, 2019
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    Summary
    This summary is machine-generated.

    This study introduces the 1+∑ method for optical athermalization in visible light cameras. The method ensures stable image quality and optical performance despite significant temperature variations.

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    Area of Science:

    • Optical Engineering
    • Thermal Management

    Background:

    • Optical systems often suffer performance degradation due to temperature fluctuations.
    • Maintaining optical stability across wide temperature ranges is crucial for applications like aerial imaging.

    Purpose of the Study:

    • To propose and validate a novel method for achieving optical athermalization in the visible waveband.
    • To design a long focal length aerial camera system with enhanced thermal stability.

    Main Methods:

    • The 1+∑ method, utilizing a double-lens equivalent model, was developed.
    • Synthetic weights of thermal and chromatic power were calculated to replace glass elements.
    • A complex aerial camera design was simulated across a 100°C temperature difference.

    Main Results:

    • The 1+∑ method successfully achieved optical athermalization.
    • The designed aerial camera maintained high image quality over the tested temperature range.
    • Stable optical performance was demonstrated under large thermal gradients.

    Conclusions:

    • The 1+∑ method is an effective approach for optical athermalization in visible waveband systems.
    • The developed design provides a robust solution for long focal length aerial cameras operating in variable thermal environments.