Spectroscopic Characterization of Nonconcerted [4 + 2] Cycloaddition of 1,3-Butadiene with Lanthanacyclopropene To Form Lanthanum–Benzene in the Gas Phase

2017 ◽  
Vol 121 (6) ◽  
pp. 1233-1239 ◽  
Author(s):  
Dilrukshi Hewage ◽  
Wenjin Cao ◽  
Jong Hyun Kim ◽  
Ya Wang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Gas Phase ◽  
Spectroscopic Characterization

Laser Diagnostics of Semiconductor Processing Systems

1984 ◽  
Vol 38 ◽  
Author(s):  
Joda C. Wormhoudt ◽  
Alan C. Stanton ◽  
Joel A. Silver
Keyword(s):  
Gas Phase ◽  
Plasma Etching ◽  
Vapor Deposition ◽  
Laser Diagnostics ◽  
Semiconductor Industry ◽  
Spectroscopic Characterization ◽  
Detection Sensitivity ◽  
Semiconductor Processing ◽  
Laser Techniques

AbstractTwo processes of great importance in the semiconductor industry are vapor deposition and plasma etching. This paper presents a review of laser techniques for spectroscopic characterization of the gas phase species involved in these processes. Band strength and other spectroscopic data for selected molecules are used to give estimates of the detection sensitivity in vibrational and electronic bands. Preliminary results are given from work presently in progress in our laboratory on the detection of such species. The discussion includes examples of the application of these techniques to a number of laboratory deposition and etching devices.

Observation of alkaline earth complexes M(CO)8 (M = Ca, Sr, or Ba) that mimic transition metals

Science ◽  
2018 ◽  
Vol 361 (6405) ◽  
pp. 912-916 ◽  
Author(s):  
Xuan Wu ◽  
Lili Zhao ◽  
Jiaye Jin ◽  
Sudip Pan ◽  
Wei Li ◽  
...  
Keyword(s):  
Gas Phase ◽  
Alkaline Earth ◽  
Principal Quantum Number ◽  
Spectroscopic Characterization ◽  
Alkaline Earth Metals ◽  
Matrix Analysis ◽  
Carbonyl Complexes ◽  
Metal Chemistry ◽  
Cation Complexes

The alkaline earth metals calcium (Ca), strontium (Sr), and barium (Ba) typically engage in chemical bonding as classical main-group elements through their ns and np valence orbitals, where n is the principal quantum number. Here we report the isolation and spectroscopic characterization of eight-coordinate carbonyl complexes M(CO)8 (where M = Ca, Sr, or Ba) in a low-temperature neon matrix. Analysis of the electronic structure of these cubic Oh-symmetric complexes reveals that the metal–carbon monoxide (CO) bonds arise mainly from [M(dπ)] → (CO)8 π backdonation, which explains the strong observed red shift of the C-O stretching frequencies. The corresponding radical cation complexes were also prepared in gas phase and characterized by mass-selected infrared photodissociation spectroscopy, confirming adherence to the 18-electron rule more conventionally associated with transition metal chemistry.

Gas phase observation and microwave spectroscopic characterization of formic sulfuric anhydride

Science ◽  
2015 ◽  
Vol 349 (6243) ◽  
pp. 58-61 ◽  
Author(s):  
Rebecca B. Mackenzie ◽  
Christopher T. Dewberry ◽  
Kenneth R. Leopold
Keyword(s):  
Gas Phase ◽  
Sulfur Trioxide ◽  
Density Functional ◽  
Supersonic Jet ◽  
Cycloaddition Reaction ◽  
Spectroscopic Characterization ◽  
Microwave Spectroscopy ◽  
Sulfuric Anhydride ◽  
Functional Theory

We report the observation of a covalently bound species, formic sulfuric anhydride (FSA), that is produced from formic acid and sulfur trioxide under supersonic jet conditions. FSA has been structurally characterized by means of microwave spectroscopy and further investigated by using density functional theory and ab initio calculations. Theory indicates that a π2 + π2 + σ2 cycloaddition reaction between SO3 and HCOOH is a plausible pathway to FSA formation and that such a mechanism would be effectively barrierless. We speculate on the possible role that FSA may play in the Earth’s atmosphere.

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