What question did this study set out to answer?

To identify primary photochemical reactions of carbon disulfide under vacuum ultraviolet irradiation and determine the precise carbon-sulfur bond dissociation energy.

May 1, 1972The Journal of Chemical Physics

Photodissociation of CS2 in the Vacuum Ultraviolet; Determination of D° (SC—S)

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HOH. OkabeHoward University

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Implication

Spectroscopic analysis reveals vacuum ultraviolet photodissociation pathways and bond energy in carbon disulfide, indicating predissociation occurring through excited Rydberg states.

Key Points

To identify primary photochemical reactions of carbon disulfide under vacuum ultraviolet irradiation and determine the precise carbon-sulfur bond dissociation energy.
Irradiated gaseous carbon disulfide with vacuum ultraviolet radiation across the 1200–1400 Å region, including photolysis at the 1236 Å line.
Measured absorption coefficients and recorded CS A 1Π to X 1Σ fluorescence excitation spectra.
Calculated the single-bond dissociation energy D0° (SC—S) directly from the threshold photon energy required to induce fluorescence.
Determined that primary photodissociation produces CS A 1Π and S 3P2, yielding a bond dissociation energy D0° (SC—S) of 4.463 ± 0.014 eV (102.9 ± 0.32 kcal/mole).
Identified that the reaction is driven by predissociation from Rydberg series I and II states, with fluorescence efficiency decreasing substantially above the first ionization potential.
Demonstrated that 1236 Å photolysis populates vibrational levels in the photofragment CS A 1Π state up to v′ = 5.

Cite This Study

H. Okabe (1972) studied this question.

synapsesocial.com/papers/6a916968ae2c4ed52ef1305a https://doi.org/10.1063/1.1677876

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Implication

Spectroscopic analysis reveals vacuum ultraviolet photodissociation pathways and bond energy in carbon disulfide, indicating predissociation occurring through excited Rydberg states.

Photodissociation of CS2 in the Vacuum Ultraviolet; Determination of D° (SC—S)

Discussion

Member takes

Implication

Key Points

Cite This Study

Photodissociation of CS2 in the Vacuum Ultraviolet; Determination of D° (SC—S)

Discussion

Member takes

Implication

Key Points

Cite This Study

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