An investigation of secondary ion yield enhancement using Bin2+ (n=1, 3, 5) primary ions

Nagy, Gabriella; Lu, Peng; Walker, Amy V.

doi:10.1016/j.jasms.2007.10.016

Cited by 18 publications

(12 citation statements)

References 38 publications

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“…In agreement with previous reports [28,30,[35][36][37], the performances of Bi 3 + and Bi 3 ++ were found to be similar (for example, Figure 3d and e). Different pulse widths were, however, required to obtain similar currents: 160 ns for the Bi 3 + beam and 250 ns for the Bi 3 ++ beam at the maximum current.…”

Section: Bi 3 + or Bi 3 ++supporting

confidence: 93%

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Zhou

Yao

Ding

et al. 2016

J. Am. Soc. Mass Spectrom.

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Abstract. In situ liquid secondary ion mass spectrometry (SIMS) enabled by system for analysis at the liquid vacuum interface (SALVI) has proven to be a promising new tool to provide molecular information at solid-liquid and liquid-vacuum interfaces. However, the initial data showed that useful signals in positive ion spectra are too weak to be meaningful in most cases. In addition, it is difficult to obtain strong negative molecular ion signals when m/z>200. These two drawbacks have been the biggest obstacle towards practical use of this new analytical approach. In this study, we report that strong and reliable positive and negative molecular signals are achievable after optimizing the SIMS experimental conditions. Four model systems, including a 1,8-diazabicycloundec-7-ene (DBU)-base switchable ionic liquid, a live Shewanella oneidensis biofilm, a hydrated mammalian epithelia cell, and an electrolyte popularly used in Li ion batteries were studied. A signal enhancement of about two orders of magnitude was obtained in comparison with non-optimized conditions. Therefore, molecular ion signal intensity has become very acceptable for use of in situ liquid SIMS to study solid-liquid and liquid-vacuum interfaces.

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Section: Bi 3 + or Bi 3 ++supporting

confidence: 93%

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Zhou

Yao

Ding

et al. 2016

J. Am. Soc. Mass Spectrom.

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“…The ability to analyze this material in substance enables one to study the enhancement in secondary ion yield without interferences from substrate wafers, such as silicon, aluminium and silver, and from different sample preparation conditions. [13] Experimental 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][NTf 2 ] (Scheme 1) was prepared by an established synthetic method [20] and was used after drying for several hours at approximately 10 −6 mbar. The spectra were obtained from neat ionic liquids in a customized molybdenum sample holder to ensure a smooth surface so as to obtain good spectra (i.e.…”

Section: ++mentioning

confidence: 99%

“…[14] The difference between the measured ion currents was at maximum ±5%, which is in good agreement with previously published data. [12,13,14] Typical operation conditions and beam performance are summarized in Table 4. Primary ion energy was 25 keV for single charged ion clusters, and 50 keV for double charged ion clusters.…”

Section: ++mentioning

confidence: 99%

“…Polyatomic projectiles, such as SF 5 + , [1,2,3,4] C 60 + , [5,6,7] Au n + [8,9] and Bi n + , [10,11,12,13,14] greatly enhance the secondary ion yields of large fragments, thus leading to a clearer material identification. Especially, the bismuth liquid metal ion gun [15] (LMIG) is of great interest due to the capability of emitting doubly charged ion species, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide under Bi_n^x+ cluster ion bombardment

Holzweber

Hutter

2010

Surface & Interface Analysis

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Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to study 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide under Bi-ion and Bi-cluster-ion (Bi 2 -7 + , Bi 3,5,7 ++ ) bombardment in positive and negative polarity. Peak pattern as well as practical experiences with the bismuth cluster LMIG is discussed. Mass spectra with the best mass resolution were obtained using Bi 3 ++ or Bi 5 ++ as primary ion source. The secondary ion yield of high molecular ion is enhanced up to two orders of magnitude upon changing from ion to cluster ion bombardment.

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“…[20,21] The difference between the measured ion currents was at maximum ±5% which is in good agreement to previously published data. [20,22,23] and a primary ion energy of 25 keV for single charged ion clusters and 50 keV for double charged ion clusters. For each measurement the primary ion dose density was set to 1 × 10 10 ions cm −2 ensuring static conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ionic liquids under Bi‐ion and Bi‐cluster ions bombardment by ToF‐SIMS

2010

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A systematic study of five different imidazolium-based room temperature ionic liquids, 1-butyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium nitrate, 1-butyl-3-methylimidazolium iodide, 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide were carried out by means of time-of-flight secondary ion mass spectrometry (ToF-SIMS) in positive and negative ion mode. The compounds were measured under Bi-ion and Bi-cluster ions (Bi(2-7)(+), Bi(3, 5)(2+)) bombardment, and spectral information and general rules for the fragmentation pattern are presented. Evidence for hydrogen bonding, due to high molecular secondary cluster ions, could be found. Hydrogen bonding strength could be estimated by ToF-SIMS via correlation of the anionic yield enhancement with solvent parameters.

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An investigation of secondary ion yield enhancement using Bi_n²⁺ (n=1, 3, 5) primary ions

Cited by 18 publications

References 38 publications

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Investigation of 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide under Bi_n^x+ cluster ion bombardment

Investigation of ionic liquids under Bi‐ion and Bi‐cluster ions bombardment by ToF‐SIMS

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An investigation of secondary ion yield enhancement using Bin2+ (n=1, 3, 5) primary ions

Cited by 18 publications

References 38 publications

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Improving the Molecular Ion Signal Intensity for In Situ Liquid SIMS Analysis

Investigation of 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide under Binx+ cluster ion bombardment

Investigation of ionic liquids under Bi‐ion and Bi‐cluster ions bombardment by ToF‐SIMS

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An investigation of secondary ion yield enhancement using Bi_n²⁺ (n=1, 3, 5) primary ions

Investigation of 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide under Bi_n^x+ cluster ion bombardment