1
|
Kumar A, Singh SK, Shirhatti PR. A versatile and narrow linewidth infrared radiation source for ro-vibration state-selected preparation of molecules in molecular beams. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:113001. [PMID: 37947498 DOI: 10.1063/5.0157912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 10/09/2023] [Indexed: 11/12/2023]
Abstract
We describe the design and characterization of a versatile pulsed (5 ns, 10 Hz repetition rate) optical parametric oscillator and amplifier system capable of generating single longitudinal mode, narrow linewidth (0.01 cm-1) radiations in the wavelength range of 680-870 nm and 1380-4650 nm. Using a combination of power-normalized photoacoustic signal and a Fizeau interferometer-based wavemeter, we are able to actively stabilize the output wavenumber to within 0.005 cm-1 (3σ) over a timescale longer than 1000 s. We demonstrate an application of this system by performing ro-vibration state-selected preparation of CO in the v = 2 state, via direct overtone excitation (v = 0 → 2 at 2346 nm) and subsequent state-selected detection in an internally cold molecular beam.
Collapse
Affiliation(s)
- Avinash Kumar
- Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally, Hyderabad 500046, Telangana, India
| | - Saurabh Kumar Singh
- Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally, Hyderabad 500046, Telangana, India
| | - Pranav R Shirhatti
- Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally, Hyderabad 500046, Telangana, India
| |
Collapse
|
2
|
Chu W, Li Z, Gu J, Zhang Q, Chen Y, Zhao D. Continuous wave cavity ringdown spectroscopy incorporating with an off-axis arrangement, white noise perturbation, and optical re-injection. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:114104. [PMID: 37947499 DOI: 10.1063/5.0172162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 10/17/2023] [Indexed: 11/12/2023]
Abstract
We present an ultra-sensitive continuous wave cavity ringdown spectroscopy (cw-CRDS) spectrometer to record high resolution spectra of reactive radicals and ions in a pulsed supersonic plasma. The spectrometer employs a home-made external cavity diode laser as the tunable light source, with its wavelength modulated by radio-frequency white noise. The ringdown cavity with a finesse of ∼105 is arranged with an off-axis alignment. The combination of the off-axis cavity and the white-noise perturbed laser yields quasi-continuum laser-cavity coupling without the need of mode matching. The cavity is further incorporated with an extra multi-pass cavity for optical re-injection of light reflected off the master cavity, which significantly increases the throughput power of the high-finesse cavity. A fast switchable semiconductor optical amplifier is used to modulate the cw laser beam to square wave pulses and to initialize timing controlled ringdown events, which are synchronized to the plasma pulses with an accuracy of ∼3 µs. The performance and potential of the cw-CRDS spectrometer are illustrated and discussed, based on the high resolution near-infrared spectroscopic detection of trace 13C13C radicals generated in a pulsed supersonic C2H2/Ar plasma with a pulse duration of ∼50 µs.
Collapse
Affiliation(s)
- Wangyou Chu
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Zhenzhen Li
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Jieqiong Gu
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Qiang Zhang
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yang Chen
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Dongfeng Zhao
- Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| |
Collapse
|
3
|
Xiao Z, Gu J, Wang Z, Chu W, Zhang Q, Chen Y, Zhao D. A BaGa4Se7 crystal based pulsed mid-infrared light source with a narrow linewidth in 4-12 µm. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:093001. [PMID: 37676085 DOI: 10.1063/5.0167190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 08/20/2023] [Indexed: 09/08/2023]
Abstract
We present a BaGa4Se7 (BGSe) crystal based coherent pulsed light source for high resolution mid-infrared (MIR) spectroscopy in the 4-12 µm region. The all-solid-state system consists of an injection seeded optical parametric generator (OPG) and an optical parametric amplifier (OPA) using two KTiOPO4 crystals. The idler output of OPG-OPA and the fundamental output (1064 nm) of a wavelength stabilized Nd:YAG laser are employed for difference frequency generation of MIR pulses in the BGSe crystal. Pulsed MIR radiation in the 4-12 µm range is obtained with typical pulse energies higher than 100 µJ and pulse durations of ∼5 ns. By measuring H2O absorption lines in the 8 µm region with this MIR light source and a cavity ring-down spectrometer, the linewidth of the MIR source is inferred as 120 ± 10 MHz, which is very close to the Fourier-transform limited linewidth of 5 ns laser pulses.
Collapse
Affiliation(s)
- Zengjun Xiao
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Jieqiong Gu
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Zhaofeng Wang
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Wangyou Chu
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Qiang Zhang
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yang Chen
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Dongfeng Zhao
- Hefei National Research Center for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| |
Collapse
|
4
|
Yu C, Xiao Z, Chu W, Zhang Q, Chen Y, Zhao D. High-Resolution Electronic Spectrum of the 1,4,6-Heptatrienyl Radical in the Gas Phase. J Phys Chem A 2022; 126:8398-8403. [DOI: 10.1021/acs.jpca.2c05596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chunting Yu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Zengjun Xiao
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Wangyou Chu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Qiang Zhang
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Yang Chen
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Dongfeng Zhao
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| |
Collapse
|
5
|
Yu C, Xiao Z, Dong B, Chu W, Guan J, Wang Z, Zhang Q, Chen Y, Zhao D. Gas-Phase Optical Spectra of the Indenyl Radical and Its Quantitative Detection in a Jet-Stirred Reactor. J Phys Chem A 2022; 126:4630-4635. [PMID: 35793234 DOI: 10.1021/acs.jpca.2c03024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Resonance-stabilized radicals (RSRs), such as the indenyl radical (C9H7), are proposed to be initiator radicals in soot inception and growth in hydrocarbon combustion processes, but spectroscopic data for many RSRs are still lacking. In this work, the gas-phase optical absorption spectra of the B̃2A2-X̃2A2 electronic transition of indenyl were identified in a supersonic indene/argon plasma jet. Spectroscopic parameters, including the transition energy, rotational constants, and upper-state lifetime broadening, were obtained from analysis of the experimental spectra. The results were readily applied to the quantitative detection of indenyl produced from high-temperature reactions in a jet-stirred reactor. This study now makes indenyl optically accessible in further reaction kinetics studies and in situ spectroscopic diagnostics of hydrocarbon combustion processes.
Collapse
Affiliation(s)
- Chunting Yu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Zengjun Xiao
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Bin Dong
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China
| | - Wangyou Chu
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Jiwen Guan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China
| | - Zhandong Wang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China
| | - Qiang Zhang
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yang Chen
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Dongfeng Zhao
- Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| |
Collapse
|
6
|
Gu J, Yu C, Xiao Z, Zhang Q, Chen Y, Zhao D. High-resolution laser spectroscopy of the trans- and cis-1-vinylpropargyl radicals. J Chem Phys 2022; 156:056101. [DOI: 10.1063/5.0078580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jingwang Gu
- University of Science and Technology of China, China
| | - Chunting Yu
- University of Science and Technology of China, China
| | - Zengjun Xiao
- University of Science and Technology of China, China
| | - Qiang Zhang
- University of Science and Technology of China, China
| | - Yang Chen
- Department of Chemical Physics, University of Science and Technology of China, China
| | - Dongfeng Zhao
- University of Science and Technology of China, China
| |
Collapse
|
7
|
Zhang Q, Zhang DP, Zhu BX, Gu JW, Zhao DF, Chena Y. Reinvestigate the C2Π-X2Π(0,0) band of AgO. CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp1912223] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Qiang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
- Paul Scherrer Institue, CH-5232 Villigen, Switzerland
| | - De-ping Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Bo-xing Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Jing-wang Gu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Dong-feng Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Yang Chena
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| |
Collapse
|