Quantum-mechanical study of laser induced desorption of physisorbed molecules on dielectric surfaces

Shiang, Keh-Dong

doi:10.1016/0039-6028(93)90397-3

Cited by 5 publications

(2 citation statements)

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“…It is well known that laser irradiation can enhance the desorption process of molecules physisorbed on surfaces . In Figure b,d, we present the PL spectra of as-grown and eight-month aged monolayer WS 2 irradiated by focused laser beam with incident power density of ∼40 kW/cm 2 for 30 s. LS emission in both samples was suppressed greatly, indicating that some of the impurities on WS 2 in this area have been removed after laser exposure.…”

Section: Resultsmentioning

confidence: 93%

Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing

Wang

et al. 2016

ACS Nano

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Understanding the stability of monolayer transition metal dichalcogenides in atmospheric conditions has important consequences for their handling, life-span, and utilization in applications. We show that cryogenic photoluminescence spectroscopy (PL) is a highly sensitive technique to the detection of oxidation induced degradation of monolayer tungsten disulfide (WS2) caused by exposure to ambient conditions. Although long-term exposure to atmospheric conditions causes massive degradation from oxidation that is optically visible, short-term exposure produces no obvious changes to the PL or Raman spectra measured at either room temperature or even cryogenic environment. Laser processing was employed to remove the surface adsorbents, which enables the defect states to be detected via cryogenic PL spectroscopy. Thermal cycling to room temperature and back down to 77 K shows the process is reversible. We also monitor the degradation process of WS2 using this method, which shows that the defect related peak can be observed after one month aging in ambient conditions.

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Section: Resultsmentioning

confidence: 93%

Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing

Wang

et al. 2016

ACS Nano

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“…)Pd(9)sin9 with 9 from 0 to 1t, where Pd(9) is the desorption probability with the uniformly random angle distribution, the thermal averaged desorption probability is then estimated to be 1 x 10-5 • CONCLUSION A classical trajectory calculation is performed for the desorption of HF molecule on a LiF(OOI) surface using apo-. I 106 tenua we constructed before.…”

Section: Smentioning

confidence: 99%

Classical Trajectory Study of HF Desorption on LiF(001) Surface

Shiang

1994

J Chinese Chemical Soc

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We report a classical trajectory study of the molecular desorption of a vibrationaly excited HF adsorbed on a corrugated LiF(001) surface. The desorption is induced by either a vibrational deexcitation of the adsorbed molecule (vibrational desorption) or an active motion of the surface ion (thermal desorption). A brief description of the calculation of the gas molecule/surface interaction potential is first presented. By applying this potential, Hamilton's equations of motion can be numerically integrated with the initial conditions selected, thus the dynamics is simulated. The result gives a clear indication about the features of the evolution of the vibrational, rotational and translational energies with increase of time. The angular momentum and translational energy distributions of the desorbed molecule are presented. Desorption probabilities for different initial states of the adsorbed molecule are also predicted, which are influenced by the polar‐angle‐dependent potential and the excitation of the initial vibrational level. The surface phonon mode is found to be strongly coupled to the vibrational, rotational, translational modes of the molecule and surface bond.

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New Directions in Science Technology—Atomically-Thin Metal Dichalcogenides

Zhuiykov¹

2018

Nanostructured Semiconductors

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Quantum-mechanical study of laser induced desorption of physisorbed molecules on dielectric surfaces

Cited by 5 publications

References 58 publications

Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing

Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing

Classical Trajectory Study of HF Desorption on LiF(001) Surface

New Directions in Science Technology—Atomically-Thin Metal Dichalcogenides

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Quantum-mechanical study of laser induced desorption of physisorbed molecules on dielectric surfaces

Cited by 5 publications

References 58 publications

Revealing Defect-State Photoluminescence in Monolayer WS2 by Cryogenic Laser Processing

Revealing Defect-State Photoluminescence in Monolayer WS2 by Cryogenic Laser Processing

Classical Trajectory Study of HF Desorption on LiF(001) Surface

New Directions in Science Technology—Atomically-Thin Metal Dichalcogenides

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Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing

Revealing Defect-State Photoluminescence in Monolayer WS₂ by Cryogenic Laser Processing