skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Time-Resolved Kinetic Chirped-Pulse Rotational Spectroscopy in a Room-Temperature Flow Reactor

Journal Article · · Journal of Physical Chemistry Letters

Chirped-pulse Fourier transform millimeter-wave spectroscopy is a potentially powerful tool for studying chemical reaction dynamics and kinetics. Branching ratios of multiple reaction products and intermediates can be measured with unprecedented chemical specificity; molecular isomers, conformers, and vibrational states have distinct rotational spectra. Here we demonstrate chirped-pulse spectroscopy of vinyl cyanide photoproducts in a flow tube reactor at ambient temperature of 295 K and pressures of 1-10 mu bar. This in situ and time-resolved experiment illustrates the utility of this novel approach to investigating chemical reaction dynamics and kinetics. Following 193 nm photodissociation of CH2CHCN, we observe rotational relaxation of energized HCN, HNC, and HCCCN photoproducts with 10 mu s time resolution and sample the vibrational population distribution of HCCCN. The experimental branching ratio HCN/HCCCN is compared with a model based on RRKM theory using high-level ab initio calculations, which were in turn validated by comparisons to Active Thermochemical Tables enthalpies.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1426235
Journal Information:
Journal of Physical Chemistry Letters, Vol. 8, Issue 24; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

References (75)

Kinetics of polyatomic free radicals produced by laser photolysis. 5. Study of the equilibrium methyl + oxygen .dblarw. CH3O2 between 421 and 538.degree. journal September 1985
The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics journal October 2008
Direct Measurements of Conformer-Dependent Reactivity of the Criegee Intermediate CH3CHOO journal April 2013
Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene journal February 2015
Probing the low-temperature chain-branching mechanism of n -butane autoignition chemistry via time-resolved measurements of ketohydroperoxide formation in photolytically initiated n- C 4 H 10 oxidation journal January 2015
Vibrational relaxation in seeded supersonic alkali halide beams journal October 1977
Collision-induced energy flow between vibrational modes of small polyatomic molecules journal November 1981
Vibrational relaxation of linear molecules in a nozzle expansion journal October 1984
Chirped-pulse millimeter-wave spectroscopy for dynamics and kinetics studies of pyrolysis reactions journal January 2014
Observation of Transition-State Vibrational Thresholds in the Rate of Dissociation of Ketene journal June 1992
The Roaming Atom: Straying from the Reaction Path in Formaldehyde Decomposition journal November 2004
A new approach toward transition state spectroscopy journal January 2013
Determination of the Rate Constant for the OH(X 2 Π) + OH(X 2 Π) → H 2 O + O( 3 P) Reaction Over the Temperature Range 295 to 701 K journal December 2013
Three-center versus four-center elimination in photolysis of vinyl fluoride and vinyl bromide at 193 nm: Bimodal rotational distribution of HF and HBr (v⩽5) detected with time-resolved Fourier transform spectroscopy journal May 2001
Photodissociation of vinyl cyanide at 193 nm: Nascent product distributions of the molecular elimination channels journal January 2009
Photolysis (193 nm) of SO 2 : Nascent Product Energy Distribution Examined through IR Emission journal December 2011
Direct frequency comb measurement of OD + CO -> DOCO kinetics journal October 2016
Application of Microwave Spectroscopy to Kinetic Study of the Reaction of Carbonyl Sulfide with Atomic Oxygen journal June 1978
Millimeter‐wave detection of free radicals using pulsed laser photolysis journal August 1985
Millimeter- and Submillimeter-wave Kinetic Spectroscopy of Reaction Intermediates journal January 1987
Branching ratios in atomic oxygen (3P) reactions of terminal olefins studied by kinetic microwave absorption spectroscopy journal February 1991
The rotational spectrum of epifluorohydrin measured by chirped-pulse Fourier transform microwave spectroscopy journal August 2006
A broadband Fourier transform microwave spectrometer based on chirped pulse excitation journal May 2008
Measuring Picosecond Isomerization Kinetics via Broadband Microwave Spectroscopy journal May 2008
Conformational isomerization kinetics of pent-1-en-4-yne with 3,330 cm-1 of internal energy measured by dynamic rotational spectroscopy journal August 2008
Broadband Molecular Rotational Spectroscopy Special Issue journal October 2012
Structures of Cage, Prism, and Book Isomers of Water Hexamer from Broadband Rotational Spectroscopy journal May 2012
A Ka-band chirped-pulse Fourier transform microwave spectrometer journal October 2012
Broadband Rotational Spectroscopy for Molecular Structure and Dynamics Studies journal January 2013
Perspective: The first ten years of broadband chirped pulse Fourier transform microwave spectroscopy journal May 2016
Design and evaluation of a pulsed-jet chirped-pulse millimeter-wave spectrometer for the 70–102 GHz region journal July 2011
Chirped-pulse terahertz spectroscopy for broadband trace gas sensing journal January 2011
An arbitrary waveform generator based chirped pulse Fourier transform spectrometer operating from 260 to 295GHz journal October 2012
Concerted hydrogen-bond breaking by quantum tunneling in the water hexamer prism journal March 2016
Dissociation Pathways of 2,3-Dihydrofuran Measured by Chirped-Pulse Fourier Transform Microwave Spectroscopy journal April 2010
THE DETECTION OF INTERSTELLAR ETHANIMINE (CH 3 CHNH) FROM OBSERVATIONS TAKEN DURING THE GBT PRIMOS SURVEY journal February 2013
Exotic SiO 2 H 2 Isomers: Theory and Experiment Working in Harmony journal May 2016
A chirped-pulse Fourier-transform microwave/pulsed uniform flow spectrometer. II. Performance and applications for reaction dynamics journal December 2014
Chirped-Pulse Fourier Transform Microwave Spectroscopy Coupled with a Flash Pyrolysis Microreactor: Structural Determination of the Reactive Intermediate Cyclopentadienone journal June 2014
A Signature of Roaming Dynamics in the Thermal Decomposition of Ethyl Nitrite: Chirped-Pulse Rotational Spectroscopy and Kinetic Modeling journal October 2014
A chirped-pulse Fourier-transform microwave/pulsed uniform flow spectrometer. I. The low-temperature flow system journal October 2014
Photodissociation of acrylonitrile at 193 nm: A photofragment translational spectroscopy study using synchrotron radiation for product photoionization journal April 1998
The unimolecular dissociation of vinylcyanide: A theoretical investigation of a complex multichannel reaction journal February 1999
The radical photodissociation channel of acrylonitrile journal December 1996
Ab Initio and RRKM Study of the HCN/HNC Elimination Channels from Vinyl Cyanide journal February 2011
The photodissociation mechanisms of acrylonitrile: Ab initio calculations on reaction channels and surface intersections journal November 2008
Pseudo-equilibrium geometry of HNO determined by an E-Band CP-FTmmW spectrometer journal July 2017
Broadband Fourier transform rotational spectroscopy for structure determination: The water heptamer journal May 2013
Pure Rotational Spectrum of HCN in the Terahertz Region: Use of a New Planar Schottky Diode Multiplier journal July 2000
The Millimeter- and Submillimeter-Wave Spectrum of HC3N in the Ground and Vibrationally Excited States journal November 2000
Laboratory Measurements of the Hyperfine Structure of H 14 N 12 C and D 14 N 12 C journal September 2006
Ro-vibrational relaxation of HCN in collisions with He: Rigid bender treatment of the bending-rotation interaction journal September 2013
The rotational excitation of HCN and HNC by He: temperature dependence of the collisional rate coefficients: Rotational excitation of HCN and HNC by He journal May 2010
Collisional excitation of HC 3 N by para- and ortho-H 2 journal May 2016
Kinetics and thermochemistry of the acetyl radical: study of the acetyl + hydrogen bromide .fwdarw. acetaldehyde + bromine atom reaction journal July 1992
The broadband rotational spectrum of fully deuterated acetaldehyde (CD3CDO) in a CW supersonic expansion journal December 2017
Complete experimental rovibrational eigenenergies of HCN up to 6880 cm −1 above the ground state journal June 2011
Chirped-pulse millimeter-wave spectroscopy: Spectrum, dynamics, and manipulation of Rydberg–Rydberg transitions journal January 2013
Multi-resonance effects within a single chirp in broadband rotational spectroscopy: The rapid adiabatic passage regime for benzonitrile journal October 2012
Chirped-Pulse Millimeter-Wave Spectroscopy of Rydberg-Rydberg Transitions journal September 2011
Edge effects in chirped-pulse Fourier transform microwave spectra journal June 2015
Transient emission, off‐resonant transient absorption, and Fourier transform microwave spectroscopy journal November 1974
Submillimeter, Millimeter, and Microwave Spectral line Catalog journal November 1998
PGOPHER: A program for simulating rotational, vibrational and electronic spectra journal January 2017
Systematic exploration of the mechanism of chemical reactions: the global reaction route mapping (GRRM) strategy using the ADDF and AFIR methods journal January 2013
An automated method to find transition states using chemical dynamics simulations journal November 2014
An automated transition state search using classical trajectories initialized at multiple minima journal January 2015
Introduction to Active Thermochemical Tables:  Several “Key” Enthalpies of Formation Revisited journal November 2004
Active Thermochemical Tables: thermochemistry for the 21st century journal January 2005
Active Thermochemical Tables: Sequential Bond Dissociation Enthalpies of Methane, Ethane, and Methanol and the Related Thermochemistry journal February 2015
High-Accuracy Estimates for the Vinylidene-Acetylene Isomerization Energy and the Ground State Rotational Constants of :C═CH 2 journal May 2013
Weakly Bound Free Radicals in Combustion: “Prompt” Dissociation of Formyl Radicals and Its Effect on Laminar Flame Speeds journal December 2015
From theoretical reaction dynamics to chemical modeling of combustion journal January 2017
Catalysis by clusters with precise numbers of atoms journal July 2015
Copper Cluster Size Effect in Methanol Synthesis from CO 2 journal May 2017

Cited By (7)

Photodissociation transition states characterized by chirped pulse millimeter wave spectroscopy journal December 2019
Quantitative analysis of gas phase molecular constituents using frequency-modulated rotational spectroscopy journal May 2019
Photochemical isomerization reactions of acrylonitrile. A mechanistic study journal January 2018
The Hunt for Elusive Molecules: Insights from Joint Theoretical and Experimental Investigations journal March 2019
Automated assignment of rotational spectra using artificial neural networks journal September 2018
Direct Measurements of Small Polar Impurities in Gasoline Mixtures Using Molecular Rotational Resonance Spectroscopy journal September 2019
Automated Assignment of Rotational Spectra Using Artificial Neural Networks conference June 2018